"WardsSci000450"

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

Sale

Glassy; most specimens float in water.

Shiny black volcanic glass showing conchoidal fracture and some spherulites.

Dark gray with abundant gas pocket vesicles.

Coarse, 'salt and pepper': dark pyroxene and light andesine. Provides perfect representation of an intermediate igneous rock.

Porphyritic igneous rock containing biotite, feldspar, and hornblende.

Gray andesite with phenocrysts of felspar and/or hornblende.

Grayish black trap rock.

Sale

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

Abundant small black phenocrysts in a gray to brown matrix.