Apatite is found in various igneous rocks as a secondary mineral, and an industrially valuable deposit can be formed in alkaline rock. The large-scale apatite deposits are mainly sedimentary genesis of shallow seas, mainly composed of phosphate rock, which is the cause of China's Hubei Yichang, Yunnan Kunyang, and Guizhou Kaiyang phosphate mines. Apatite is the main inorganic substance in the human and animal hardware (tooth, bone, stone) and an important biological material.
Apatite is a general name for a class of calcium-containing phosphate minerals. Its chemical composition is Ca5(PO4)3(F, Cl, OH), which contains 55.38% of CaO, 42.06% of P2O3, and 1.25% of F. The Cl content was 2.33% and the H2O content was 0.56%.
A general term for a phosphate mineral having a chemical formula of (X5ZO4)3F, Cl, OH) and a crystal of a hexagonal system. Mineral family name. Wherein X represents Ca, Sr, Ba, Pb, Na, Ce, Y, etc., Z is mainly P, and may be As, V, Si or the like. The most common mineral species is fluoroapatite Ca5PO43F, followed by chloroapatite Ca5PO43Cl, hydroxyapatite Ca5PO43(OH), oxysilicon apatite Ca5(Si,P,S)O43(O,OH,F) , 锶 apatite Sr5PO43F and so on. Apatite crystals are common, generally hexagonal columns with cones; aggregates are granular, dense blocks, tuberculosis; variants in colloidal form are called apatite, and their ore is called colloidal phosphate.
The apatite is light green, yellowish green, maroon and other colors, and the glass is lustrous. With incomplete cleavage, the fracture is not flat. Moss hardness 5, specific gravity 3.18 ~ 3.21. Phosphorescence often occurs after heating. The ammonium molybdate powder is placed on the apatite, and nitric acid is added to form yellow ammonium phosphomolybdate for rapid phosphorus determination. As a by-mineral, apatite is found in various igneous rocks, and mineral deposits of industrial value can be formed in alkaline rock, such as the Xibine apatite-neixite mine in the Kola Peninsula, Russia. The large-scale apatite deposits are mainly sedimentary genesis of shallow seas, mainly composed of phosphate rock, such as China's Hubei Puyang, Yunnan Kunyang, Guizhou Kaiyang Phosphate, or sedimentary metamorphic deposits formed by their metamorphism.
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