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Johnsomervilleite

#PD48245
SOLD
Johnsomervilleite from Sapucaia mine, Galileia, Doce valley, Minas Gerais, Brazil - PD48245
Johnsomervilleite from Sapucaia mine, Galileia, Doce valley, Minas Gerais, Brazil - PD48245

Johnsomervilleite

#PD48245
Availability
Sold
Size
0.9 x 0.4 x 0.3 cm - Thumbnail 
Formula
Na10Ca6Mg18Fe2+25(PO4)36 (RRUFF)
Locality
Sapucaia mine, Galileia, Doce valley, Minas Gerais, Brazil

A small 9mm specimen of mostly black to dark brown Na-Ca-Mg-Fe phosphate with a resinous luster much like Griphite. Johnsomervilleite is terrestrially a very rare mineral found only in four pegmatites worldwide. The type locality in Scotland is a sillimanite-kyanite schist. The remaining four known localities are from meteorites. It probably is more common than the list implies.

Johnsomervilleite

Formula
Na10Ca6Mg18Fe2+25(PO4)36 
Crystal System
Trigonal 
Crystal Habit
Granular, Dendritic, Colloform 
Cleavage
Perfect, None, None 
Luster
Vitreous (Glassy) 
Color
dark brown, blackish gray 
Streak
light brown 
Class
Trigonal - Rhombohedral 
Fracture
Brittle - Splintery 
Hardness
4.5 

Data courtesy of Webmineral.

Collection
Don Phillips Collection
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