"WardsSci000450"

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

Dark gray with abundant gas pocket vesicles.

Gray andesite with phenocrysts of felspar and/or hornblende.

Grayish black trap rock.

Abundant small black phenocrysts in a gray to brown matrix.

Classic, very coarse-grained igneous texture.

Dark gray, composed mostly of pyroxene and olivine.

Coarse-grained plagioclase and pyroxene with some olivine.

Pale pink felsite, with small sanidine phenocrysts.

Coarse-grained, with microcline, biotite and horblende phenocrysts.