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These specimens are also approximately 30 square inches in area but are 1 inch thick.
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M436 - Selenite is a gypsum material used as a plaster and in cement. Selenite is a Hydrous calcium sulfate. Hardness 1-1/2 to 2. Can be scratched with your fingernail. Gypsum is a very common sulfate mineral. Although it may be found in several rock types, it develops principally in sedimentary rocks of chemical origin, where it forms rock gypsum deposits in the beds that may be up to 30 feet in thickness. It also occurs associated with dolomite and barite in hydrothermal replacement deposits. We have divided up all our present stock into four price/weight ranges:
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