General Information:
Chemical Formula:
Ca3(BO3)2
Composition:
(Molecular Weight = 355.47 gm)
Calcium 33.82 % Ca
Boron 12.16 % B
Oxygen 54.01 % O
Empirical Formula:
Ca3(BO3)2
Environment:
In a vein developed along the boundary between crystalline limestone and gehlenite-spurrite skarn. Ca-analog to kotoite and jotoite.
IMA Status:
Approved IMA
Locality:
Fuka, Bitchu-Cho, Okayama Prefeture, Japan.
Name Origin:
For Prof. Hiroshi Takeda (1934- ) , of the Mineralogial Institute, University of Tokyo.
Physical Properties:
Cleavage:
[110] Imperfect
Color:
white, pale gray, or colorless.
Density:
3.1
Diaphaniety:
Transparent
Habits:
Granular - Generally occurs as anhedral to subhedral crystals in matrix., ,
Hardness:
4.5 - Between Fluorite and Apatite
Luminescence:
Non-fluorescent.
Luster:
Vitreous (Glassy)
Streak:
white
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