Mineralogy Database

Alum-(K) Mineral Data

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General Alum-(K) Information

Help on Chemical  Formula: Chemical Formula: KAl(SO4)2•12(H2O)
Help on Composition: Composition: Molecular Weight = 474.39 gm
   Potassium   8.24 %  K     9.93 % K2O
   Aluminum    5.69 %  Al   10.75 % Al2O3
   Hydrogen    5.10 %  H    45.57 % H2O
   Sulfur     13.52 %  S    33.75 % SO3
   Oxygen     67.45 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: KAl(SO4)2•12(H2O)
Help on Environment: Environment: Derived from the oxidation of sulfide minerals and potassium-bearing minerals.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1875
Help on Locality: Locality: Vesuvius, Italy. Alum Cave, Tennessee, USA. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the element K and the Latin, alumen.
Help on Synonym: Synonym: Native Alum
  Potash Alum
  Potassium-alum - Renamed to Alum-(K) by Mineralogical Record, v39 (2008), p131