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Classic, very coarse-grained igneous texture.

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

Dark gray, with hornblende as the dominant mafic mineral.

Coarse-grained plagioclase and pyroxene with some olivine.

Medium-grained with biotite.

Dark gray, composed mostly of pyroxene and olivine.

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

Pale pink felsite, with small sanidine phenocrysts.

Shiny black volcanic glass showing conchoidal fracture and some spherulites.

Gray, fine, friable, with abundant small sanidine crystal fragments.

Glassy; most specimens float in water.

Classic, dark; from the Columbia Plateau.

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.