Gabbro pegmatite


Gabbro pegmatite

Gabbro pegmatite

Intrusive igneous rock of intermediate composition.
Very coarse crystalline pegmatite composed of large crystals of black hornblende (amphibole) and white Ca,Na-Feldspar. Comes from large Cretaceous-age intrusive body.
From Granite Rock quarry area near Aromas, CA.

https://gotbooks.miracosta.edu/rocks/igneous/12.html

2/2/2021