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Underearth — fine-grained osadochnayagorny breed, powdered in a dry state, flexible when moistening. Clay consists of one or several minerals of group of kaolinite (there is from the name of the district a Kaolin in China), montmorillonite or other layered aluminosilicates (clay minerals), but may contain both sandy and carbonate particles. As a rule, rock forming mineral in clay is kaolinite, its structure: 47% (Mas) of silicon oxide (IV) (SiO2), 39% of aluminum oxide (Al2O3) and 14% of water (H2O).
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