"WardsSci000450"

Gray andesite with phenocrysts of felspar and/or hornblende.

Gabbro is Mafic igneous rock formed deep underground consisting of olivine and pyroxene.

Anorthosite is an intrusive, igneous rock consisting of predominantly plagioclase feldspar.

Sale

Classic, very coarse-grained igneous texture.

Dark gray, composed mostly of pyroxene and olivine.

Gray-to-brown basaltic, with over 50% vesicles.

Pale pink felsite, with small sanidine phenocrysts.

Glassy; most specimens float in water.