Mineralogy Database

Pseudojohannite Mineral Data

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General Pseudojohannite Information

Help on Chemical  Formula: Chemical Formula: Cu6.5[(UO2)4O4(SO4)2]2(OH)5•25H2O
Help on Composition: Composition: Molecular Weight = 3,587.89 gm
   Uranium   52.08 %  U
   Copper    11.55 %  Cu
   Hydrogen   1.57 %  H
   Sulfur     3.59 %  S
   Oxygen    31.21 %  O
            ______ 
            100.00 % 
Help on Empirical Formula: Empirical Formula: Cu6.52U7.85S4.02O70H55.74
Help on Environment: Environment: Peudojohannite and other divalent zippeites are common, easily overlooked minerals in acid drainage environments around uranium deposits and wastes.
Help on IMA Status: IMA Status: Approved IMA 2000 (Dana # Added)
Help on Locality: Locality: J´┐Żchymov (St. Joachimsthal), Northern Bohemia, Czech Republic. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the (almost) relationship by composition with johannite.
Help on Synonym: Synonym: IMA2000-019