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gypsum
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gypsum Selenite gypsum from Naica, Chihuahua, Mex.
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Iraq museum: gypsum female figure Messinian Stage White Sands National Park Gypsum dunes
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gypsum
gypsum Gypsum from Naica, Chihuahua, Mex.

gypsum

mineral
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gypsum, common sulfate mineral of great commercial importance, composed of hydrated calcium sulfate (CaSO4·2H2O). In well-developed crystals the mineral commonly has been called selenite. The fibrous massive variety has a silky lustre and is called satin spar; it is translucent and opalescent and is valued for ornaments and jewelry. The fine-grained massive variety called alabaster is carved and polished for statuary and ornamental use when pure and translucent. Gypsite is the earthy pulverulent variety. Gypsum...

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