Granite pegmatite
Granite K-spar pegmatite

Granite pegmatite

Intrusive igneous rock of felsic composition.
Coarse crystalline rock composed of coarse to large crystal of orthoclase (pink K-spar), quartz (clear to gray), plagioclase (Na,CA-feldspar; white)), and muscovite (mica).
Peninsular Ranges Eastern granitic intrusive belt.
Anza Borrego desert region alluvial gravel deposit near Agua Caliente County Park, CA.
https://gotbooks.miracosta.edu/rocks/igneous/14.html 2/2/2021