Formula: Cu3V2O7(OH)2.2H2O
Origin of name: for Alexander von Volborth (1800-1876), Russian paleontologist who first noted the mineral.
Crystal system: Monoclinic, pseudohexagonal
Crystal class: 2/m
Twinning: common lamellar
Unit cell: a = 10.60 Å, b = 5.88 Å, c = 7.20 Å, b = 94.8°
Colour: Dark olive-green to green, yellowish green, yellow
Diaphaneity: Translucent to subtranslucent
Luster: Vitreous, oily, resinous, waxy to pearly on cleavage
Habit: Scales, triangular or hexagonal outline, scaly crusts, rosette-like, honeycombed and boxwork-like aggregates, globular
Hardness: 3.5
Specific gravity: 3.52
Cleavage: 1; {001} perfect
Tenacity:
Streak: Light green
Synonyms/varieties: knauffite, uzbekite
Comments:
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