Character identification
Traits
The product is ovoid spherical nodules, a core or hollow, but the complete is rare; usually the shell and the core separation, the shell broken into irregular square or flat block, size and thickness range; surface uneven Yellowish-brown, brownish-brown, brown; inner surface is rough with earthy yellow powder; body weight is strong, but it can be crushed, cross-section layered, with different colors, earthy yellow, brown, purple brown, grayish blue; layers Thick and thin, generally the thick brown or purple brown layer.
corn
Tuberculosis nearly spherical, rough surface, with fine powder; yellow-brown to brown; cross-section is not hierarchical, and there are many honeycomb holes; some broken, no core, with yellow powder, touch the fingers of the foul, slightly There is a sense of smoothness. Earthy gas, tasteless.
Microscopic identification
Reflective polarizers: Mineral components consist of water goethite, quartz, feldspar, rock fragments and other debris. Shell Limonite accountant is less than the center.
Shuizuo iron ore: colloidal structure under reflective light, honeycomb structure; reflection color is grayish white; slightly amorphous, reflectivity is 17% (reactive yellow); particle size is about 0.01mm, aggregate is 0.1mm Honeycomb voids are partially filled with clay and quartz. Debris particle size is generally 0.05-0.1mm, angular, semi-contact cementation. Cement is mainly clay, carbonate and iron.
Physical and chemical identification
1. Take 0.2g of the product powder, add diluted hydrochloric acid 10ml, shake, stand, the filtrate showed various reactions of iron salts.
2. Take a small amount of the product powder, placed in a test tube, closed, heated on the flame, there is a small drop of water attached to the top of the tube wall.
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