Mineralogy Database

Talmessite Mineral Data

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General Talmessite Information

Help on Chemical  Formula: Chemical Formula: Ca2Mg(AsO4)2•2(H2O)
Help on Composition: Composition: Molecular Weight = 418.33 gm
   Calcium    19.16 %  Ca   26.81 % CaO
   Magnesium   5.81 %  Mg    9.63 % MgO
   Arsenic    35.82 %  As   54.94 % As2O5
   Hydrogen    0.96 %  H     8.61 % H2O
   Oxygen     38.25 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Ca2Mg(AsO4)2•2(H2O)
Help on Environment: Environment: Secondary species formed typically in the oxidized zone of some hydrothermal mineral deposits, an alteration product of realgar, orpiment, or Cu-Ni arsenides.
Help on IMA Status: IMA Status: Approved IMA 1960
Help on Locality: Locality: Talmessi mine, 35 km west of Anarak, Iran. In the Arhbar (Aghbar) and A�it Ahmane mines, Bou Azzer district, Morocco. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the locality.
Help on Name Pronunciation: Name Pronunciation: Talmessite + Pronunciation Say TALMESSITE
Help on Synonym: Synonym: ICSD 200008
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