Mineralogy Database

Gypsum Mineral Data

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General Gypsum Information

Help on Chemical  Formula: Chemical Formula: CaSO4•2(H2O)
Help on Composition: Composition: Molecular Weight = 172.17 gm
   Calcium   23.28 %  Ca   32.57 % CaO
   Hydrogen   2.34 %  H    20.93 % H2O
   Sulfur    18.62 %  S    46.50 % SO3
   Oxygen    55.76 %  O
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Ca(SO4)•2(H2O)
Help on Environment: Environment: Sedimentary evaporite deposits.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) Prehistoric
Help on Locality: Locality: Numerous localities worldwide. Naica, Chihuahua, Mexico. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: From the Greek, gyps meaning "burned" mineral. Selenite from the Greek in allusion to its pearly luster (moon light) on cleavage fragments.
Help on Name Pronunciation: Name Pronunciation: Gypsum Say GYPSUM
Help on Synonym: Synonym: Alabaster
  ICSD 2057
  PDF 33-311
  Satin Spar