General Information:
Chemical Formula:
Ba24Ca(Fe++,Mn,Ti)2[Si12O36][Si2O7]6(O,OH)30Cl6·14(H2O)
Environment:
Sanbornite-bearing metamorphic rocks along a granodiorite contact.
IMA Status:
Approved IMA 1965
Locality:
Big Creek - Rush Creek sanbornite deposit, 5 miles NE of Trimmer, Fresno Co., California.
Name Origin:
Named for John Boardman Trask (1824-1879), first state geologist of California.
Physical Properties:
Cleavage:
None
Color:
brownish red.
Density:
3.71
Hardness:
5 - Apatite
Luster:
Vitreous (Glassy)
Streak:
light reddish brown
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