Formula: Cu2V2O7
Origin of name: For F. Donald Bloss, American mineralogist
Crystal system: Orthorhombic
Crystal class: mm2
Twinning:
Unit cell:
Colour: Black
Diaphaneity: Opaque
Luster: Metallic
Habit: Equant anhedral crystals to 150µm
Hardness:
Specific gravity: 4.05
Cleavage: None
Tenacity:
Streak: Red-brown
Synonyms/varieties:
Comments: Dimorphous with ziesite
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