Mineralogy Database

Bassanite Mineral Data

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General Bassanite Information

Help on Chemical  Formula: Chemical Formula: 2CaSO4•(H2O)
Help on Composition: Composition: Molecular Weight = 290.30 gm
   Calcium   27.61 %  Ca   38.63 % CaO
   Hydrogen   0.69 %  H     6.21 % H2O
   Sulfur    22.09 %  S    55.16 % SO3
   Oxygen    49.60 %  O
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: 2(Ca)2(SO4)•(H2O)
Help on Environment: Environment: In cavities in leucite-tephrite blocks, 1906 eruption. Dehydrates at 130 deg. C. Hydrates to gypsum in a humid atmosphere.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1910
Help on Locality: Locality: Vesuvius, Italy. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Francesco Basani (185301916). Italian paleontologist, University of Naples, Italy.
Help on Name Pronunciation: Name Pronunciation: Bassanite + Pronunciation Say BASSANITE
Help on Synonym: Synonym: Hemihydrate
  Plaster of Paris