"WardsSci000450"

Volcanic glass with snowflakes embedded throughout.

Dark gray, with hornblende as the dominant mafic mineral.

Coarse grained and abundant in plagioclase feldspar.

Fine to medium-grained with biotite.

Medium-grained with biotite.

Classic, dark; from the Columbia Plateau.

Light gray, with flow structure.

Banded volcanic glass.

Dark gray with abundant gas pocket vesicles.

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