Formula: Ca(V2V2)O10 . 5H2O
Origin of name: From Greek for black and from vanadium
Crystal system: Triclinic
Crystal class: -1
Twinning:
Unit cell:
Colour: Black
Diaphaneity: Opaque
Luster: Submetallic
Habit: Crystals prismatic, elongated, with striated or rounded prism faces, in velvety divergent aggregates
Hardness: 2.5
Specific gravity: 2.90
Cleavage: 1; {010} perfect
Tenacity:
Streak: Dark reddish brown
Synonyms/varieties:
Comments:
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