General Information:
Chemical Formula:
Cu(UO2)3(SeO3)3(OH)2·7(H2O)
Composition:
(Molecular Weight = 1,414.63 gm)
Uranium 50.48 % U
Copper 4.49 % Cu
Hydrogen 1.14 % H
Selenium 16.75 % Se
Oxygen 27.14 % O
Empirical Formula:
Cu(UO2)3(SeO3)3(OH)2·7(H2O)
Environment:
In cavities in selenian digenite.
IMA Status:
Approved IMA 1969
Locality:
Musonoi mine, Kolwezi, Shaba, Zaire.
Name Origin:
Named for Aime Marthoz (1864-1962), French mineralogist and inspector General, Bureau de Recherches Geolgiques et Miniere.
Physical Properties:
Cleavage:
[100] Perfect, [010] Indistinct
Color:
greenish brown or yellow green.
Density:
4.44
Habits:
Bladed - Aggregates of thin lath-like crystals (e.g. kyanite)., ,
Hardness:
6 - Orthoclase
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