"Ward's Phenomena"

Abundant small black phenocrysts in a gray to brown matrix.

Classic, dark; from the Columbia Plateau.

Dark gray, composed mostly of pyroxene and olivine.

Samples of Intrusive and Extrusive Igneous Rocks

Banded volcanic glass.

Volcanic glass with snowflakes embedded throughout.

Includes: six each of obsidian, pumice, and basalt. Set of 18.

Common rocks and minerals for testing and identification studies are 2–3cm each.

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

Glassy; most specimens float in water.

Study the Formation of Different Igneous Rocks