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A colorless, white, gray, blue, or lilac mineral of anhydrous calcium sulfate, CASO4, occurring AS layers in gypsum deposits. 硬石膏，无水石膏一种无色，白色，灰色，蓝色或淡紫色无水硫酸钙矿物，CaSO4，出现在石膏沉积岩层中。
Substitute anhydrous gypsum for dihydrate gypsum in Potland cement production to study the effect of anhydrous gypsum on performance of Potland cement. 研究了在硅酸盐水泥中使用硬石膏完全代替二水石膏对硅酸盐水泥性能的影响。