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石膏是自然界比较常见的一种极普通的硫酸盐矿物。其化学成分为水合硫酸钙CaSO_4·2H_2O。它有五种不同种:(1)石膏;(2)土石膏:一种呈土状不纯的石膏;(3)雪花石膏:白色细粒块状呈半透明的变种;
Gypsum is a more common in nature, a very common sulfate minerals. Its chemical composition is calcium sulfate hydrate CaSO 4 · 2H 2 O. There are five different kinds of gypsum: (1) gypsum; (2) earth gypsum: a type of gypsum that is earthy and impure; (3) alabaster: