Mineralogy Database

Allactite Mineral Data

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General Allactite Information

Help on Chemical  Formula: Chemical Formula: Mn7(AsO4)2(OH)8
Help on Composition: Composition: Molecular Weight = 798.46 gm
   Manganese  48.16 %  Mn   62.19 % MnO
   Arsenic    18.77 %  As   28.79 % As2O5
   Hydrogen    1.01 %  H     9.02 % H2O
   Oxygen     32.06 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Mn2+7(AsO4)2(OH)8
Help on Environment: Environment: Occurs as a rare secondary mineral in veinlets through metamorphosed manganese deposits )Sweden); in a metamorphosed stratiform zinc orebody (Franklin, New Jersey, USA).
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1884
Help on Locality: Locality: In Sweden, from the Moss and Brattfors mines, Nordmark, and at Langban, Varmland. From Franklin and Sterling Hill, Ogdensburg, Sussex Co., New Jersey, USA. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: From the Greek, to change, a reference to the strong pleochroism.
Help on Name Pronunciation: Name Pronunciation: Allactite + Pronunciation Say ALLACTITE
Help on Synonym: Synonym: Elfstorpite - Discredited 2004
  ICSD 24428
  PDF 17-748