Gypsum: CaSO4 · 2H2O crystallization chemistry: theoretical composition (WB%): Cao 32.5, SO3 46.6, H2O + 20.9. There is little change in composition. Usually a mixture of clay, organic matter, and other machinery. Sometimes it contains SiO2, Al2O3, Fe2O3, MgO, Na2O, CO2, Cl and other impurities. Structure and morphology: monoclinic system, A0 = 0.568nm, B0 = 1.518nm, C0 = 0.629nm, large = 118.23 * ?39; Z = 4. The crystal structure consists of a [SO4] 2-tetrahedron coupled with Ca2 + to form a corresponding (010) double layer, which is linked by an H2O molecule. Complete cleavage occurs in this direction. The coordination number of Ca2 + is 8, which binds 6 O2 - and 2 H2O molecules in the adjacent tetrahedron [SO4].

　　H2O分子通过氢键与[SO4]中的O2-相连，水分子通过分子键相连。斜方柱晶体类，c2h-2 /m (L2PC)。晶体常发展成板状或粒状。常见的单式:平行双面b、p、斜方柱m、l等。晶体表面常具纵向晶粒;有时是扁豆的形状。双晶是常见的，一个是基于(100)的双晶表面的加里或doxtail双晶，另一个是基于(101)的双晶表面的巴黎或箭头双晶。聚集体通常是密集的颗粒状或纤维状。这些细粒的石块被称为雪花石膏;纤维骨料称为纤维石膏。由风信子状晶体形成的罕见的莲座状聚集体。

　　H2O molecules are linked to O2 - in [SO4] by hydrogen bonds, and water molecules are linked by molecular bonds. Orthorhombic crystals, c2h-2 / M (l2pc). Crystals often develop into plates or grains. Common single type: parallel double-sided B, P, inclined square column m, l, etc. The crystal surface often has longitudinal grains; sometimes the shape of lentils. Double crystals are common, one is based on (100) double crystal surface of Gary or doxtail double crystal, the other is based on (101) double crystal surface of Paris or arrow double crystal. Aggregates are usually dense particles or fibers. These fine stones are called alabaster; fibrous aggregates are called fibrous gypsum. A rare rosette like aggregation of hyacinth like crystals.

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