Formula: (MnO2)(Mn,Fe,Ca)(O,OH)2.nH2O
Origin of name: for Vladimir Ivanovich Vernadskii (1863-1945), Russian natrualist and geochemist. Founder of the Ukrainian academy of sciences.
Crystal system: Hexagonal
Crystal class: unknown
Twinning:
Unit cell: a = 2.84–2.86, c = 4.7
Colour: Black, chocolate brown
Diaphaneity: Opaque
Luster:
Habit: Platy, as poorly crystalline leaflets, characteristically curved and folded to resemble fibers, to some tens of Å; colloidal, dense microcrystalline
Hardness: Soft
Specific gravity: 3.0
Cleavage: none
Tenacity:
Streak: Chocolate brown
Synonyms/varieties: Wad
Comments:
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