General Information:
Chemical Formula:
Ta(OH)3(O,CO3)
Composition:
(Molecular Weight = 258.97 gm)
Tantalum 69.87 % Ta
Hydrogen 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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