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Griphite

#DS45159
SOLD
Griphite from Riverton Lode, Pennington Co., South Dakota, United States - DS45159
Griphite from Riverton Lode, Pennington Co., South Dakota, United States - DS45159

Griphite

#DS45159
Availability
Sold
Size
6 x 4.5 x 3 cm - Sm Cabinet 
Formula
Ca(Mn2+,Na,Li)6Fe2+Al2(PO4)6(F,OH)2 (RRUFF)
Locality
Riverton Lode, Pennington Co., South Dakota, United States
Tagged
phosphate , pegmatite mineral

Crystalline deep reddish brown mass with a greasy or resinous luster. 

Griphite is one of the few phosphates with an isometric structure although originally thought to be metamict. Indeed the name is in reference to the Greek word for "puzzling".  Moore (Min. Record, 1973) states that it is in all likelyhood it is a metasomatic product of an early primary phase.  It does not seem to form secondary phosphate minerals. It was discovered at the Riverton Load in 1891.

Type Locality

Griphite

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 

Data courtesy of Webmineral.

Collection
Shultz Collection
Special Info
Type Locality
Mineralpedia
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