Mineral Information and Data:

Asbolane
Mn4+(O,OH)2 • (Co,Ni,Mg,Ca)x(OH)2x • nH2O [CNMNC approved formula]

Named from the Greek "to soil like soot".

IMA status : Valid species (Pre-IMA 1841) Grandfathered
CLASSIFICATION 
Dana
(8th edition) :
06.04.09.01  
  (06) Hydroxides and Oxides Containing Hydroxyl
  (06.04) containing multiple cations
  (06.04.09)
  
Nickel-Strunz
(10th edition) :
04.FL.30
  (04) Oxides and Hydroxides
  (04.F) Hydroxides (without V or U)
  (04.FL) Hydroxides with H2O +- (OH); sheets of edge-sharing octahedra
  
Crystal system: Hexagonal System
Point group (H-M): Unknown — Unk
Unit cell: a = 3.04Å, c = 9.34Å
Crystal Habit: Platelets, to several μm, in thin lamellar aggregates; massive.
  
Color: Bluish to brownish black
Diaphaneity: Opaque
Luster: Dull
Streak: Black to brownish black
  
Geologic Setting: As a weathering product in silicic rocks (Russia); in siliceous schists (Kara-Chagyra, Uzbekistan); widespread in residual soils above ultramafic rocks (New Caledonia).
Mineral Association: Goethite
  
Synonyms/varieties: Black Cobalt, Cobalt graphite, Lampadite (var.)

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