Formula: (Fe,Mn)PO4 Orthorhombic
Description: Heterosite-purpurite represents a simple solid solution mineral found masses in complex granite pegmatites in association with other phosphates.
FLORENCE COUNTY: Heterosite-purpurite nodules up to 5 cm. across occur in the zoned pegmatites in sec. 22 T.39N. R.17E., near Fern. (Falster, Simmons and Moore, 1988; Koehler, 1989). The mineral is intergrown with apatite and alluaudite-varulite and readily weathers a dark brown.