General Information:
Chemical Formula:Fe+++5V++++3V+++++12O39·8.5(H2O)
Composition:(Molecular Weight = 1,820.46 gm)Vanadium 41.97 %
V Iron 15.34 %
FeHydrogen 0.94 %
H Oxygen 41.75 %
O Empirical Formula: Fe3+5V4+3V5+12O39·8.5(H2O)
Environment:Black shales.
IMA Status:Approved IMA
Locality:Northwestern Karatau, Kazakhstan.
Name Origin:Named for the locality.
Physical Properties: Cleavage:[001] Perfect
Color:black.
Density:3.4 - 3.6, Average = 3.5
Diaphaniety:Opaque
Habits:Microscopic Crystals - Crystals visible only with microscopes., ,
Hardness:2.5 - Finger Nail
Luster:Subadamantine
Streak:brownish black
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