General Information:
Chemical Formula:Ta(OH)3(O,CO3)
Composition:(Molecular Weight = 258.97 gm)Tantalum 69.87 %
TaHydrogen 1.17 %
H Carbon 1.16 %
C Oxygen 27.80 %
O Empirical Formula: Ta(OH)3O0.75(CO3)0.25
Environment:Deeply weathered granite.
IMA Status:Approved IMA 1983
Locality:Mt. Holland, Western Australia.
Name Origin:Named for Kim Robertson, (1951-), Autralian geologist of Perth, Western Autralia, who found the first specimen.
Physical Properties: Color:lemon white.
Diaphaniety:Translucent
Habits:Cryptocrystalline - Occurs as crystals too small to distinguish with the naked eye., Earthy - Dull, clay-like texture with no visible crystalline affinities, (e.g. howlite)., Friable - Loosley cohesive material that granula
Hardness:2.5 - Finger Nail
Luster:Earthy (Dull)
Streak:white
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