HELP INDEX NEXT UP PREVIOUS FEEDBACK ATG Gypsum Rock

Gypsum rock is usually white or gray, and a freshly broken piece sparkles in the light. Selenite, which is pure gypsum, is the main mineral in gypsum rock; other minerals found in gypsum rock are calcite and anhydrite. It forms from the evaporation of salt-water lakes in semi-desert or desert areas. Gypsum rock is common throughout the United States. It is used to make Plaster of Paris and filler materials. [LM] {CC} {SS}
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