Formula: Cu(UO2)3(SeO3)3(OH)2 . 7H2O
Origin of name: For Aimé Marthoz, Zairian mineralogist
Crystal system: Orthorhombic
Crystal class: 2/m 2/m 2/m
Twinning:
Unit cell: a = 16.40 Å, b = 17.20 Å, c = 6.98 Å
Colour: Yellow-green to greenish brown
Diaphaneity:
Luster:
Habit: Crystals flattened, small
Hardness:
Specific gravity: 4.44
Cleavage: 2; {100} perfect, {010} imperfect
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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