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Mineralpedia Details for Griphite

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Griphite

Griphite

A primary phosphate was discovered in 1891 at the Everly pegmatite in the Black Hills and subsequently found at the Sitting Bull and Etta mines. It has been found at only a handful of localities (5) worldwide, three in the Black Hills. Moore (MR 1973) list it at the Mt. Ida, NT, Australia also. Maybe it was redescribed from there(? comments?). It is listed as isometric, one of the few phosphates which are, but Moore suggest it is metamict or a metasomatic product of a previous phase. At any rate it is a curious looking phosphate with a distinct resinous luster and brown streak.

Formula
Ca(Mn2+,Na,Li)6Fe2+Al2(PO4)6(F,OH)2 
Crystal System
Isometric 
Crystal Habit
Reniform, Amorphous 
Cleavage
None, None, None 
Luster
Vitreous - Resinous 
Color
brownish black, yellow, dark brown 
Class
Isometric - Diploidal 
Fracture
Brittle - Conchoidal 
Hardness
5.5 
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Griphite from Sitting Bull mine, Pennington Co., South Dakota, United States

Griphite
            from Sitting Bull mine, Pennington Co., South Dakota, United States

This primary phosphate was discovered in 1891 at the Everly pegmatite in the Black Hills and subsequently found at the Sitting Bull and Etta mines. It has been found at only a handful of localities (5) worldwide, three in the Black Hills. Moore (MR 1973) list it at the Mt. Ida, NT, Australia also. Maybe it was redescribed from there(? comments?). It is listed as isometric, one of the few phosphates which are, but Moore suggest it is metamict or a metasomatic product of a previous phase. At any rate it is a curious looking phosphate with a distinct resinous luster and brown streak.

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