Formula: Cu3Fe4(VO4)6
Origin of name: For John Lyons, American mineralogist
Crystal system: Orthorhombic
Crystal class: 2/m 2/m 2/m
Twinning:
Unit cell:
Colour: Black
Diaphaneity: Opaque
Luster: Metallic
Habit: Euhedral lath-like crystals to 230 µm
Hardness:
Specific gravity:
Cleavage: 1; {001} good
Tenacity:
Streak: Dark gray
Synonyms/varieties:
Comments:
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