Gypsum has a very low thermal conductivity (hence its use as an insulating filler). A crystal of gypsum will feel noticeably warmer than, for instance, a crystal of quartz.
Gypsum is one of the more common minerals in sedimentary environments. It is a major rock forming mineral that produces massive beds, usually from precipitation out of highly saline waters.
 gypsum (rosette) |
Chemical composition - CaSO4-2(H2O) Other specimens - Click the thumbnails to enlarge 
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