Home Gypsum
V - Sulfates		 Crystal habit of Gypsum Crystal habit of Gypsum Gypsum Gypsum
 
Name   Gypsum
Chemistry   Ca[SO4]·2H2O
Hardness   1,5 - 2
Lustre   pearly, vitreous
Colour   colourless, white, rarely coloured
Streak   white 
Density [g/cm3]   2.3 - 2.4
Crystal habit   monoclinic, crystals [010], [120], [011], twins [100] = swallow tail twin,, [001] = Montmatre twin
Cleavage, Fracture   [010] perfect, [111] distinct (fracture fibrous), [100] distinct (fracture conchoidal)
other characteristics and occurrences   massive, coarse spathic, fibrous (satin spar), dense (alabaster), crystals often bend
   
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 © 2004 Büro für angewandte Mineralogie · Dr. Stephan Rudolph · D-47918 Tönisvorst
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