"Freeze-Dried Specimens"

Coarse-grained plagioclase and pyroxene with some olivine.

Classic, dark; from the Columbia Plateau.

Banded volcanic glass.

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

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

Introduce your students to rocks formed from the cooling of magma and lava.