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GYPSUM #2 Go on to: #1 | #2 | #3 | #4 Selenite gypsum 
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Physical Properties
CaSO4 . H2O; Hardness 1.5-2; Cleavage perfect one direction, distinct in other two (when visible); white, colorless, gray, yellow, red, brown; Luster pearly on cleavages. .
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Description
Selenite gypsum. Crystal variety that is colorless and transparent. Cleavage cleary seen here. Specimens like this could be confused with calcite, since it almost looks like this has rhombohedral cleavage. But gypsum is softer than a fingernail and calcite is harder, and gypsum does not react with acid while calcite does.. |
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