A sampling device and method for detecting clay mineral combination and content in arsenic sandstone

Abstract

The present invention relates to the technical field of mineral sampling, and proposes a sampling device for detecting the combination and content of clay minerals in arsenic sandstone, comprising a first sampling frame and a second sampling frame of isosceles trapezoidal shape distributed front and back, a sampling net is connected in the middle of the first sampling frame and the second sampling frame, and a connecting frame is connected at both ends of the first sampling frame and the second sampling frame. By setting the first sampling frame and the second sampling frame, and installing a sampling knife on the first sampling frame and the second sampling frame, the sampling knife is driven by the first motor and the second motor to rotate along the contour of the first sampling frame and the second sampling frame to cut the arsenic sandstone, so that the arsenic sandstone is cut to form a complete sample strip, and the arsenic sandstone is prevented from being disturbed by hammering, which affects the component distribution of the arsenic sandstone sample, and saw blades are installed on the upper and lower sides and sides of the knife seat, and the side and bottom surfaces of the arsenic sandstone can be cut and cut by moving the sampling knife up and down and forward and backward without affecting the arsenic sandstone.

Description

Technical Field

[0001] The invention relates to the technical field of mineral sampling, and in particular to a sampling device and method for detecting the combination and content of clay minerals in arsenic sandstone. Background Art

[0002] The arsenic sandstone area in the middle reaches of the Yellow River is known as the "world's worst soil erosion" due to severe rock and soil erosion. It is one of the main sources of coarse sediment in the Yellow River. Studies have shown that montmorillonite is the direct cause of the erosion vulnerability of the arsenic sandstone. By studying the clay mineral combination and content in the arsenic sandstone with different degrees of fragmentation, the mineral morphology and crystal chemical characteristics of montmorillonite, it is determined whether there is authigenic montmorillonite in the arsenic sandstone, providing mineralogical evidence for revealing the spatial differential erosion in the arsenic sandstone area. Through the mutual relationship between feldspar, quartz, authigenic montmorillonite, porosity and hardness in the arsenic sandstone, the influence of skeleton particle dissolution on the structural changes of the arsenic sandstone is revealed, providing a theoretical basis for enriching and improving the soil erosion mechanism of the arsenic sandstone area.

[0003] Sampling of arsenic sandstone mostly adopts the groove sampling method. The grooved samples must be able to ensure the quality of sampling work and the reliability of exploration results, and can truly reflect the characteristics of the mining area and mineral resources. However, in actual work, groove sampling is carried out using primitive percussion tools such as hammers and chisels, or directly cut using a single-blade saw. However, a single-blade saw can only cut the side of the rock. In order to obtain a rock sample, the bottom of the rock needs to be knocked and broken, and a whole rock sample cannot be obtained. The obtained grooved samples are poorly representative, which affects the correctness of the grooved sample analysis. In addition, it is easy to choose the wrong groove sampling method, resulting in a long sampling length, repetitive work, increased costs, and poor reliability of results.

[0004] Therefore, we have made improvements on this and proposed a sampling device and method for detecting the combination and content of clay minerals in arsenic sandstone. Summary of the invention

[0005] The technical problem to be solved by the present invention is that the length of the groove sampling is too long, a complete sample cannot be obtained, the sampling is difficult, and the reliability of the result is poor.

[0006] In order to achieve the above-mentioned invention object, the present invention provides a sampling device for detecting the combination and content of clay minerals in arsenic sandstone, including a first sampling rack and a second sampling rack of isosceles trapezoidal shape distributed front and back, a sampling net is connected in the middle of the first sampling rack and the second sampling rack, the upper ends of the first sampling rack and the second sampling rack are connected to connecting racks, the interior of the connecting rack is sleeved with moving wheels, the upper ends of the moving wheels and the connecting rack are connected to electric push rods, and the middle parts of the first sampling rack and the second sampling rack are movably connected to a plurality of sampling knives.

[0007] As a further solution of the present invention, the first sampling rack includes a first mounting frame, a plurality of first motor slots are arranged on one side of the first mounting frame, a first motor is fixedly installed inside the first motor slot, a first gear is fixedly installed on the output shaft of the first motor, a first rotating slot is opened in the middle of the first mounting frame, a first chain is sleeved inside the first rotating slot, a first connecting buckle is connected to the upper end of the first chain, and the bottom of the first connecting buckle is meshed with the first gear.

[0008] As a further solution of the present invention, the second sampling rack includes a second mounting frame, a plurality of second motor slots are arranged on one side of the second mounting frame, a second motor is fixedly mounted inside the second motor slot, a second gear is fixedly mounted on the output shaft of the second motor, a second rotating slot is opened in the middle of the second mounting frame, a second chain is sleeved inside the second rotating slot, a second connecting buckle is connected to the upper end of the second chain, and the bottom of the second connecting buckle is meshed with the second gear.

[0009] As a further solution of the present invention, the sampling knife includes a knife seat, which is C-shaped, and a plurality of saw blades are installed on the outer curved surface of the knife seat. Two sliders are symmetrically installed inside the knife seat, and the sliders are sleeved in the first rotating groove or the second rotating groove. The ends of the two sliders are connected with connecting columns, and the connecting columns are sleeved with the first connecting buckle or the second connecting buckle.

[0010] As a further solution of the present invention, the sampling net includes a plurality of parallel chains, the chains are U-shaped, and a connecting tube is sleeved in the middle of the chains, both ends of the connecting tube are fixedly connected to the first sampling rack and the second sampling rack, and a telescopic rack is telescopically connected in the middle of the connecting tube.

[0011] As a further solution of the present invention, a first storage slot is provided on the front side of the first installation frame, and the sampling net is fixedly connected to the first storage slot; a second storage slot is provided on the rear side of the second installation frame, and the sampling net is fixedly connected to the second storage slot, and the sampling net is folded and stored inside the first storage slot and the second storage slot.

[0012] As a further solution of the present invention, a handle is connected to the outer side of the connecting frame.

[0013] As a further solution of the present invention, the number of the sampling knives installed on the first sampling rack or the second sampling rack is not less than twenty.

[0014] A sampling method for detecting the composition and content of clay minerals in arsenic sandstone, using the above-mentioned sampling device for detecting the composition and content of clay minerals in arsenic sandstone, comprises the following steps:

[0015] S1. Move the device to a flat sampling pit in the arsenic sandstone area, start the power supply of the device, the first motor drives the first gear to rotate, and the second motor drives the second gear to rotate, so that the first chain and the second chain simultaneously drive the sampling knives on the first sampling rack and the second sampling rack to rotate at high speed, and two staff members respectively fix and hold the connecting racks installed on the first sampling rack and the second sampling rack to ensure the positioning of the moving wheel while assisting the electric push rod to exert force downward, so that the rotating sampling knife cuts the arsenic sandstone downward, and when cutting to a certain depth, the two people drag the first sampling rack and the second sampling rack at a uniform speed in the forward and backward directions respectively, so that the sampling knives installed on the first sampling rack and the second sampling rack cut from the bottom of the rock;

[0016] S2. While the first sampling rack and the second sampling rack are moving, the sampling net connected in the middle of the first sampling rack and the second sampling rack supports and wraps the bottom of the rock. After reaching a certain length, the electric push rod pulls the connecting rack upward from the arsenic sandstone. While pulling, the sampling knife cuts off both ends of the arsenic sandstone sample. As the connecting rack, the first sampling rack and the second sampling rack are lifted up, the sampling net synchronously lifts the entire arsenic sandstone sample strip produced by the sampling upward, and then the arsenic sandstone samples are collected, calibrated every 0.5 meters in the horizontal direction and sampled in sequence. The sampling standard is a small block of arsenic sandstone rock sample with an undisturbed structure.

[0017] The present invention provides a sampling device and method for detecting the composition and content of clay minerals in arsenic sandstone, and its beneficial effects are:

[0018] 1. A first sampling rack and a second sampling rack are provided, and sampling knives are installed on the first sampling rack and the second sampling rack. The sampling knives are driven by the first motor and the second motor to rotate along the contours of the first sampling rack and the second sampling rack to cut the arsenic sandstone, so that the arsenic sandstone is cut into a complete sample strip, thereby avoiding the disturbance of the arsenic sandstone by hammering and affecting the component distribution of the arsenic sandstone sample. Saw blades are installed on the upper and lower parts and sides of the knife holder. The side and bottom surfaces of the arsenic sandstone can be cut and cut by moving the sampling knife up and down and forward and backward without affecting the arsenic sandstone.

[0019] 2. A sampling net is connected between the first sampling rack and the second sampling rack. As the first sampling rack and the second sampling rack are pulled apart, the sampling net is laid at the bottom of the cut rock sample to distinguish the sample from the arsenic sandstone below the sample. At the same time, it is convenient to quickly pull out the arsenic sandstone sample as a whole after cutting by the first sampling rack and the second sampling rack, so as to ensure the integrity and accuracy of the sample.

[0020] 3. By folding the sampling net in the middle of the first sampling rack and the second sampling rack, and installing the first sampling rack and the second sampling rack through moving wheels and a connecting rack, it is convenient to support and use the entire device through the moving wheels and the connecting rack, and to facilitate the transportation, storage and height adjustment of the entire device. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 A schematic diagram of the structure of a sampling device for detecting the composition and content of clay minerals in arsenic sandstone provided in the present application;

[0023] Figure 2 A folding schematic diagram of a sampling device for detecting clay mineral composition and content in arsenic sandstone provided in the present application;

[0024] Figure 3 A schematic diagram of the structure of a first sampling frame of a sampling device for detecting clay mineral composition and content in arsenic sandstone provided in the present application;

[0025] Figure 4 A schematic diagram of the structure of a second sampling frame of a sampling device for detecting clay mineral composition and content in arsenic sandstone provided in the present application;

[0026] Figure 5 A schematic diagram of the sampling network structure of a sampling device for detecting clay mineral combination and content in arsenic sandstone provided in the present application;

[0027] Figure 6 A schematic diagram of the first installation frame structure of a sampling device for detecting clay mineral composition and content in arsenic sandstone provided in the present application;

[0028] Figure 7 A cross-sectional view of the structure of a first sampling frame of a sampling device for detecting clay mineral composition and content in arsenic sandstone provided in the present application;

[0029] Figure 8 A cross-sectional view of the structure of a second sampling frame of a sampling device for detecting clay mineral composition and content in arsenic sandstone provided in the present application;

[0030] Fig. 9 A schematic diagram of the first chain structure of a sampling device for detecting clay mineral combination and content in arsenic sandstone provided in the present application;

[0031] Fig.10 A schematic diagram of the structure of a sampling knife of a sampling device for detecting clay mineral combination and content in arsenic sandstone provided in the present application.

[0032] In the figure: 1. moving wheel; 2. connecting frame; 3. first sampling frame; 31. first installation frame; 32. first storage slot; 33. first rotating slot; 34. first motor slot; 35. first motor; 36. first gear; 37. first chain; 38. first connecting buckle; 4. second sampling frame; 41. second installation frame; 42. second storage slot; 43. second rotating slot; 44. second motor slot; 45. second motor; 46. second gear; 47. second chain; 48. second connecting buckle; 5. sampling knife; 51. knife holder; 52. saw blade; 53. slider; 54. connecting column; 6. sampling net; 61. chain; 62. connecting tube; 63. telescopic frame; 7. electric push rod. DETAILED DESCRIPTION

[0033] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples of the specification. The following examples are only used to illustrate the present invention, but cannot be used to limit the scope of the present invention.

[0034] like Figure 1-Figure 10 As shown, this embodiment proposes a sampling device for detecting the combination and content of clay minerals in arsenic sandstone, including a first sampling frame 3 and a second sampling frame 4 of isosceles trapezoidal shape distributed front and back, a sampling net 6 is connected in the middle of the first sampling frame 3 and the second sampling frame 4, the upper ends of the first sampling frame 3 and the second sampling frame 4 are connected to a connecting frame 2, the interior of the connecting frame 2 is sleeved with a moving wheel 1, the upper ends of the moving wheel 1 and the connecting frame 2 are connected to an electric push rod 7, and the middle parts of the first sampling frame 3 and the second sampling frame 4 are movably connected to a plurality of sampling knives 5.

[0035] The first sampling frame 3 includes a first installation frame 31, and a plurality of first motor slots 34 are provided on one side of the first installation frame 31. A first motor 35 is fixedly installed inside the first motor slot 34, and a first gear 36 is fixedly installed on the output shaft of the first motor 35. A first rotating slot 33 is opened in the middle of the first installation frame 31, and a first chain 37 is sleeved inside the first rotating slot 33. The upper end of the first chain 37 is connected with a first connecting buckle 38, and the bottom of the first connecting buckle 38 is meshed and connected with the first gear 36. The first connecting buckle 38 is sleeved inside the first installation frame 31, and the first connecting buckle 38 is connected to the sampling knife 5, so that the sampling knife 5 is driven at a uniform and stable speed. The meshing of the first chain 37 and the first gear 36 enables the multiple first motors 35 installed on the first installation frame 31 to drive the sampling knife 5 at the same time, thereby improving the power of the sampling knife 5 and enabling the sampling knife 5 to cut the arsenic sandstone with high stability.

[0036] The second sampling frame 4 includes a second mounting frame 41, and a plurality of second motor slots 44 are provided on one side of the second mounting frame 41. A second motor 45 is fixedly installed inside the second motor slot 44, and a second gear 46 is fixedly installed on the output shaft of the second motor 45. A second rotating slot 43 is provided in the middle of the second mounting frame 41, and a second chain 47 is sleeved inside the second rotating slot 43. A second connecting buckle 48 is connected to the upper end of the second chain 47, and the bottom of the second connecting buckle 48 is meshed and connected with the second gear 46. A second connecting buckle 48 is sleeved inside the second mounting frame 41, and the second connecting buckle 48 is connected to the sampling knife 5, so that the sampling knife 5 is driven at a uniform and stable speed, and the meshing of the second chain 47 and the second gear 46 enables the plurality of second motors 45 installed on the second mounting frame 41 to drive the sampling knife 5 at the same time, thereby improving the power of the sampling knife 5 and enabling the sampling knife 5 to cut the arsenic sandstone with high stability.

[0037] The sampling knife 5 includes a knife seat 51, which is C-shaped, and a plurality of saw blades 52 are installed on the outer arc surface of the knife seat 51. Two sliders 53 are symmetrically installed inside the knife seat 51, and the sliders 53 are sleeved in the first rotating groove 33 or the second rotating groove 43. The ends of the two sliders 53 are connected with connecting columns 54, and the connecting columns 54 are sleeved with the first connecting buckle 38 or the second connecting buckle 48. The knife seat 51 is rotatably installed inside the first sampling frame 3 and the second sampling frame 4 through the sliders 53 and the connecting columns 54, and rotates at high speed along the contours of the first sampling frame 3 and the second sampling frame 4 to cut and cut the arsenic sandstone, which is convenient for sampling the arsenic sandstone.

[0038] The sampling net 6 includes a plurality of parallel chains 61, the chain 61 is U-shaped, and a connecting tube 62 is sleeved in the middle of the chain 61, both ends of the connecting tube 62 are fixedly connected to the first sampling rack 3 and the second sampling rack 4, and a telescopic rack 63 is telescopically connected in the middle of the connecting tube 62. The sampling net 6 is laid to separate the bottom of the rock sample, which is convenient for taking the rock upward as a whole, thereby improving the portability of arsenic sandstone sampling and the accuracy of the data.

[0039] A first storage slot 32 is provided on the front side of the first installation frame 31, and the sampling net 6 is fixedly connected to the first storage slot 32. A second storage slot 42 is provided on the rear side of the second installation frame 41, and the sampling net 6 is fixedly connected to the second storage slot 42, and the sampling net 6 is folded and stored inside the first storage slot 32 and the second storage slot 42, leaving a space in the middle of the first storage slot 32 and the second storage slot 42. When the first sampling rack 3 and the second sampling rack 4 are in a folded state, the sampling net 6 is stored in the first storage slot 32 and the second storage slot 42 as a whole, and when the first sampling rack 3 and the second sampling rack 4 are pulled apart, the sampling net 6 will be unfolded with the first sampling rack 3 and the second sampling rack 4, laying and separating the bottom of the rock sample, making it convenient to take the rock out as a whole, thereby improving the portability of arsenic sandstone sampling and the accuracy of the data.

[0040] A handle is connected to the outside of the connecting frame 2. The handle on the connecting frame 2 facilitates pulling the first sampling frame 3 and the second sampling frame 4, and assists the first sampling frame 3 and the second sampling frame 4 to move up and down and forward and backward, so as to facilitate the completion of sampling of arsenic sandstone.

[0041] The number of sampling knives 5 installed on the first sampling rack 3 or the second sampling rack 4 is not less than twenty. By installing multiple sampling knives 5 on the first sampling rack 3 and the second sampling rack 4, the sampling knives 5 are chain-shaped. As the sampling knives 5 rotate at high speed, the multiple sampling knives 5 can cut the rock quickly and efficiently, which is convenient for sampling arsenic sandstone.

[0042] A sampling method for detecting the composition and content of clay minerals in arsenic sandstone, using the above-mentioned sampling device for detecting the composition and content of clay minerals in arsenic sandstone, comprises the following steps:

[0043] S1, move the device to a plane sampling pit in the arsenic sandstone area, start the power supply of the device, the first motor 35 drives the first gear 36 to rotate, and the second motor 45 drives the second gear 46 to rotate, so that the first chain 37 and the second chain 47 simultaneously drive the sampling knife 5 on the first sampling rack 3 and the second sampling rack 4 to rotate at a high speed, two staff members respectively fix and hold the connecting frame 2 installed on the first sampling rack 3 and the second sampling rack 4, ensure the positioning of the moving wheel 1, and assist the electric push rod 7 to exert force downward, so that the rotating sampling knife 5 cuts the arsenic sandstone downward, and when cutting to a certain depth, the two people drag the first sampling rack 3 and the second sampling rack 4 at a uniform speed in the forward and backward directions respectively, so that the sampling knife 5 installed on the first sampling rack 3 and the second sampling rack 4 is cut from the bottom of the rock;

[0044] S2, and while the first sampling rack 3 and the second sampling rack 4 are moving, the sampling net 6 connected in the middle of the first sampling rack 3 and the second sampling rack 4 supports and wraps the bottom of the rock. After reaching a certain length, the electric push rod 7 pulls the connecting rack 2 upward from the arsenic sandstone. While pulling, the sampling knife 5 cuts off the two ends of the arsenic sandstone sample, and as the connecting rack 2, the first sampling rack 3 and the second sampling rack 4 are lifted up, the sampling net 6 synchronously lifts the entire arsenic sandstone sample strip produced by the sampling upward, and then the arsenic sandstone samples are collected, calibrated every 0.5 meters in the horizontal direction and sampled in sequence, and the sampling standard is a small block of arsenic sandstone rock sample with undisturbed structure.

[0045] The contents not described in detail in this specification belong to the prior art known to professionals in this field.

[0046] The above embodiments are only used to illustrate the present invention, but not to limit the present invention. Although the present invention is described in detail with reference to the embodiments, it should be understood by those skilled in the art that various combinations, modifications or equivalent substitutions of the technical solutions of the present invention do not depart from the spirit and scope of the technical solutions of the present invention, and should be included in the scope of the claims of the present invention.

Claims

1. A sampling device for detecting clay mineral composition and content in arsenic sandstone, comprising a first sampling frame (3) and a second sampling frame (4) in an isosceles trapezoidal shape arranged front and back, characterized in that: A sampling net (6) is connected in the middle of the first sampling rack (3) and the second sampling rack (4); the upper ends of the first sampling rack (3) and the second sampling rack (4) are connected to a connecting rack (2); a moving wheel (1) is sleeved inside the connecting rack (2); the upper ends of the moving wheel (1) and the connecting rack (2) are connected to an electric push rod (7); and the middle parts of the first sampling rack (3) and the second sampling rack (4) are movably connected to a plurality of sampling knives (5); The first sampling rack (3) comprises a first mounting frame (31), a plurality of first motor slots (34) are provided on one side of the first mounting frame (31), a first motor (35) is fixedly installed inside the first motor slot (34), a first gear (36) is fixedly installed on the output shaft of the first motor (35), a first rotating slot (33) is provided in the middle of the first mounting frame (31), a first chain (37) is sleeved inside the first rotating slot (33), a first connecting buckle (38) is connected to the upper end of the first chain (37), and the bottom of the first connecting buckle (38) is meshedly connected to the first gear (36); The second sampling rack (4) comprises a second mounting frame (41), a plurality of second motor slots (44) are provided on one side of the second mounting frame (41), a second motor (45) is fixedly installed inside the second motor slot (44), a second gear (46) is fixedly installed on the output shaft of the second motor (45), a second rotating slot (43) is provided in the middle of the second mounting frame (41), a second chain (47) is sleeved inside the second rotating slot (43), a second connecting buckle (48) is connected to the upper end of the second chain (47), and the bottom of the second connecting buckle (48) is meshed with the second gear (46); The sampling knife (5) comprises a knife seat (51), the knife seat (51) is C-shaped, and a plurality of saw blades (52) are installed on the outer curved surface of the knife seat (51), and two sliders (53) are installed symmetrically in the upper and lower parts of the knife seat (51), and the sliders (53) are sleeved in the first rotating groove (33) or the second rotating groove (43), and the ends of the two sliders (53) are connected to connecting columns (54), and the connecting columns (54) are sleeved with the first connecting buckle (38) or the second connecting buckle (48).

2. A sampling device for detecting the composition and content of clay minerals in arsenic sandstone according to claim 1, characterized in that: The sampling net (6) comprises a plurality of mutually parallel chains (61), the chains (61) being U-shaped, and a connecting tube (62) being sleeved in the middle of the chains (61), the two ends of the connecting tube (62) being fixedly connected to the first sampling rack (3) and the second sampling rack (4), and the middle of the connecting tube (62) being telescopically connected to a telescopic rack (63).

3. A sampling device for detecting the composition and content of clay minerals in arsenic sandstone according to claim 1, characterized in that: A first storage slot (32) is provided on the front side of the first installation frame (31), and the sampling net (6) is fixedly connected to the first storage slot (32). A second storage slot (42) is provided on the rear side of the second installation frame (41), and the sampling net (6) is fixedly connected to the second storage slot (42), and the sampling net (6) is folded and stored inside the first storage slot (32) and the second storage slot (42).

4. A sampling device for detecting clay mineral composition and content in arsenic sandstone according to claim 1, characterized in that: A handle is connected to the outer side of the connecting frame (2).

5. A sampling device for detecting clay mineral composition and content in arsenic sandstone according to claim 1, characterized in that: The number of the sampling knives (5) installed on the first sampling rack (3) or the second sampling rack (4) is no less than twenty.

6. A sampling method for detecting the composition and content of clay minerals in arsenic sandstone, characterized in that: The sampling device for detecting the composition and content of clay minerals in arsenic sandstone according to any one of claims 1 to 5 comprises the following steps: S1. Move the device to a flat sampling pit in the arsenic sandstone area, start the device power supply, drive the first motor (35) to rotate the first gear (36), and the second motor (45) to rotate the second gear (46), so that the first chain (37) and the second chain (47) simultaneously drive the sampling knives (5) on the first sampling rack (3) and the second sampling rack (4) to rotate at a high speed, and two staff members respectively fix and hold the connecting racks (2) installed on the first sampling rack (3) and the second sampling rack (4), ensure the positioning of the moving wheel (1) and assist the electric push rod (7) to exert force downward, so that the rotating sampling knife (5) cuts the arsenic sandstone downward, and when the cutting reaches a certain depth, the two people drag the first sampling rack (3) and the second sampling rack (4) in the forward and backward directions at a uniform speed, so that the sampling knives (5) installed on the first sampling rack (3) and the second sampling rack (4) cut from the bottom of the rock; S2, while the first sampling rack (3) and the second sampling rack (4) are moving, the sampling net (6) connected in the middle of the first sampling rack (3) and the second sampling rack (4) supports and wraps the bottom of the rock. After reaching a certain length, the electric push rod (7) pulls the connecting rack (2) upward from the arsenic sandstone. While pulling, the sampling knife (5) cuts off both ends of the arsenic sandstone sample. As the connecting rack (2), the first sampling rack (3) and the second sampling rack (4) are lifted up, the sampling net (6) synchronously lifts the entire arsenic sandstone sample strip produced by sampling upward, and then the arsenic sandstone samples are collected, calibrated every 0.5 meters in the horizontal direction and sampled in sequence. The sampling standard is a small block of arsenic sandstone rock sample with an undisturbed structure.

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