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分子通過氫鍵與[SO4]中的O2-相連，水分子通過分子鍵相連。斜方柱晶體類，c2h-2 /m (L2PC)。晶體常發展成板狀或粒狀。常見的單式:平行雙面b、p、斜方柱m、l等。晶體表面常具縱向晶粒;有時是扁豆的形狀。雙晶是常見的，一個是基于(100)的雙晶表面的加里或doxtail雙晶，另一個是基于(101)的雙晶表面的巴黎或箭頭雙晶。聚集體通常是密集的顆粒狀或纖維狀。這些細粒的石塊被稱為雪花石膏;纖維骨料稱為纖維石膏。由風信子狀晶體形成的罕見的蓮座狀聚集體。

　　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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