General Information:
Chemical Formula:
(Ba,K)(Fe++,Mg)3(Si,Al,Fe)4O10(O,OH)2
Environment:
Found in iron ores.
Locality:
Wilagedera prospect, North Western Province, Sri Lanka.
Name Origin:
Named for Ananda Kentish Coomaraswamy (1877-1947), first director of the Mineral Survey of Ceylon (Sri Lanka).
Physical Properties:
Cleavage:
[001] Perfect
Color:
black.
Density:
3.94
Diaphaniety:
Subtranslucent to opaque
Habits:
Massive - Uniformly indistinguishable crystals forming large masses., ,
Hardness:
3-4 - Calcite-Fluorite
Luminescence:
Non-fluorescent.
Luster:
Vitreous (Glassy)
Streak:
gray white
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