calcium sulfate
121Selenite — This article is about the mineral: for other meanings, see Selenite (disambiguation). Selenite, satin spar, desert rose, and gypsum flower are four varieties of gypsum; all four varieties show obvious crystalline structure. The four crystalline… …
122Cretaceous–Tertiary extinction event — Artist s rendering of bolide impact Badlands nea …
123Lake pigment — A Lake pigment is a pigment manufactured by precipitating a dye with an inert binder, usually a metallic salt. Manufacturers and suppliers to artists and industry frequently omit the lake designation in the name. Many lake pigments are fugitive… …
124Chalkboard — Blackboard redirects here. For other uses, see Blackboard (disambiguation). For other uses, see Chalkboard (disambiguation). A quadruple blackboard at the Helsinki University of Technology A chalkboard or blackboard is a reusable writing surface… …
125White Portland cement — or white ordinary Portland cement (WOPC) is similar to ordinary, gray Portland cement in all respects except for its high degree of whiteness. Obtaining this color requires substantial modification to the method of manufacture, and because of… …
126Gypsisol — ▪ FAO soil group one of the 30 soil groups in the classification system of the Food and Agriculture Organization (FAO) (soil). Gypsisols are characterized by a subsurface layer of gypsum (a hydrated calcium sulfate) accumulated by the… …
127geology — /jee ol euh jee/, n., pl. geologies. 1. the science that deals with the dynamics and physical history of the earth, the rocks of which it is composed, and the physical, chemical, and biological changes that the earth has undergone or is… …
128Plaster — The term plaster can refer to plaster of Paris, lime plaster, or cement plaster. This article deals mainly with plaster of Paris.Plaster of Paris is a type of building material based on calcium sulfate hemihydrate, nominally CaSO4·0.5H2O. It is… …
