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Glassy; most specimens float in water.

Pale pink felsite, with small sanidine phenocrysts.

Fine to medium-grained with biotite.

Light gray, with flow structure.

Grayish black trap rock.

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

Dark gray with abundant gas pocket vesicles.

Abundant small black phenocrysts in a gray to brown matrix.

Gray andesite with phenocrysts of felspar and/or hornblende.

Samples of Intrusive and Extrusive Igneous Rocks