Takedaite

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
More details...