Formula: Pb2V2O7
Origin of name: For J. Chervet, French mineralogist
Crystal system: Monoclinic
Crystal class: 2/m
Twinning: Common on {100}, contact or polysynthetic
Unit cell: a = 13.30 Ǻ, b = 7.14 Ǻ, c = 7.08 Ǻ, β = 106°
Colour: Colourless to gray to brown
Diaphaneity:
Luster: Adamantine
Habit: Crystals to large size; also pseudomorphs of francevillite
Hardness: <3
Specific gravity: 6.30 to 6.49
Cleavage: 2; {100} and {010} ?
Tenacity:
Streak: White
Synonyms/varieties:
Comments:
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