Walstromite

General Information:
 Chemical Formula:
BaCa2Si3O9
 Composition:
(Molecular Weight = 445.73 gm)
Barium 30.81 % Ba
Calcium 17.98 % Ca
Silicon 18.90 % Si
Oxygen 32.31 % O 
 Empirical Formula:
BaCa2Si3O9
 Environment:
Metamorphosed metasediments.
 IMA Status:
Approved IMA 1965
 Locality:
Big Creek - Rush Creek sanbornite deposit, 5 miles NE of Trimmer, Fresno Co., California.
 Name Origin:
Named for Robert E. Walstrom (1920-), American mineral collector, who discovered the mineral.
Physical Properties:
 Cleavage:
[011] Perfect, [010] Perfect, [100] Very Good
 Color:
colorless or white.
 Density:
3.67
 Diaphaniety:
Transparent
 Habits:
Granular - Generally occurs as anhedral to subhedral crystals in matrix., ,
 Hardness:
3.5 - Copper Penny
 Luminescence:
Fluorescent, Short UV=pale pink, Long UV=pinkish orange.
 Luster:
Vitreous - Pearly
 Streak:
white
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