Massive resinous brown griphite in pegmatite matrix. From Riverton Lode, Harney City, South Dakota. Scale is in centimeters. (Photo by W. Cordua.)
Formula: Na4Li2Ca6(Mn,Fe,Mg)19Al8(PO4)24(F,OH)8 Isometric
Description: Griphite is generally found as dark brown to black resinous masses in complex granite pegmatites. It is frequently associated and intergrown with other rare phosphate minerals.
FLORENCE COUNTY: Griphite occurs as yellow brown to black resinous crusts and nodules up to 1 cm. in diameter in the zoned pegmatite in NW NE sec. 22 T.39N. R.17E., near Fern. (Koehler, 1989).
Properties of minerals 