Mineralogy Database

Alpersite Mineral Data

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General Alpersite Information

Help on Chemical  Formula: Chemical Formula: (Mg,Cu)SO4•7H2O
Help on Composition: Composition: Molecular Weight = 262.74 gm
   Magnesium   5.37 %  Mg    8.90 % MgO
   Manganese   0.42 %  Mn    0.54 % MnO
   Zinc        0.50 %  Zn    0.62 % ZnO
   Iron        0.21 %  Fe    0.27 % FeO
   Copper      8.95 %  Cu   11.20 % CuO
   Hydrogen    5.37 %  H    48.00 % H2O
   Sulfur     12.20 %  S    30.47 % SO3
   Oxygen     66.98 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Mg0.58Cu0.37Zn0.02Mn2+0.02Fe2+0.01(SO4)•7(H2O)
Help on Environment: Environment: Formed from acid mine waste waters with mineralogically zoned assemblages in sheltered areas at a relative humidity of 65% and T = 4 °C. Dehydrates to cuprian pentahydrate. Mg-domin ant analog of melanterite.
Help on IMA Status: IMA Status: Approved IMA 2003 (Dana # Added)
Help on Locality: Locality: Big Mike mine located on the south side of Panther Canyon, on the west flank of the north end of the Tobin Range, Pershing County, Nevada, USA. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named after Charles N. Alpers, geochemist with the United States Geological Survey, who has made significant contributions to our understanding of the mineralogical controls of mine -water geochemistry.
Help on Synonym: Synonym: IMA2003-040