"Avantor"

Classic, dark; from the Columbia Plateau.

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

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

Banded volcanic glass.

Coarse grained and abundant in plagioclase feldspar.

Volcanic glass with snowflakes embedded throughout.