Mineralogy Database

Lukrahnite Mineral Data

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General Lukrahnite Information

Help on Chemical Formula: Chemical Formula: Ca(Cu,Zn)(Fe,Zn)(AsO4)2(OH,H2O)2
Help on Composition: Composition: Molecular Weight = 468.74 gm
   Calcium    8.55 %  Ca   11.96 % CaO
   Zinc       6.98 %  Zn    8.68 % ZnO
   Iron       9.53 %  Fe   13.63 % Fe2O3
   Copper     8.13 %  Cu    9.16 % Cu2O
   Arsenic   31.97 %  As   49.03 % As2O5
   Hydrogen   0.71 %  H     6.34 % H2O
   Oxygen    34.13 %  O
            ______        ______ 
            100.00 %       98.81 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: CaCu0.6Zn0.5Fe3+0.8(AsO4)2(H2O)1.3(OH)0.7
Help on Environment: Environment: Ca analog of gartrellite. Tsumcorite group
Help on IMA Status: IMA Status: Approved IMA 1999 (Dana # Added)
Help on Locality: Locality: Tsumeb mine, Namibia. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Ludger Krahn (1957-), Geologischer Dienst Nordrhein-Westfalen, geologist who provided the initial specimen for study.
Help on Synonym: Synonym: IMA1999-030