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GYPSUM #1 (detail) Go on to: #1 | #2 | #3 | #4 Alabaster Gypsum 
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Composition
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. |
Description
Observe the white marks on the rock. These are places the rock has been damaged. The smudged white appearance is typical of gypsum when it has been powdered.
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