Gypsum is a soft white mineral used as the Level 2 hardness example on the Mohs Scale. Desert roses are a

A desert rose

brown variety of gypsum mixed with barite.. Some white gypsum is transparent. The name gypsum comes from the Ancient Greek word gypsos, meaning "plaster". Crystalline gypsum is called selenite. It is a common mineral often found in sedimentary rocks.

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