Gypsum | Earth Sciences Museum | University of Waterloo
Gypsum Crystal, unknown Locality. University of Waterloo Earth Sciences Museum Collection. Gypsum can be found as thick layers in shale and as attractive crystals. Rock Gypsum soft, granular, white to gray, with 3040% impurities ; Selenite pure crystalline gypsum found in transparent monoclinic crystals ; Alabaster white, compact, fine grained variety used for carving