The Collaborative International Dictionary
Protogine
Protogine \Pro"to*gine\, n. [Proto- + root of Gr. gi`gnesqai to be born: cf. F. protogyne.] (Min.) A kind of granite or gneiss containing a silvery talcose mineral.
Wiktionary
protogine
n. (context geology English) A form of granite containing silvery flakes of talc or similar minerals