"Ward's® Thermochemistry In The Bag Inquiry Demonstration Activities"

1 pound of black sand packaged in a heat-sealed bag.

Light gray, fine-grained, well-foliated, schistose.

Massive, chlorite-rich.

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

Red-brown to gray, coarse-grained, containing feldspar and mica.

Gray and poorly sorted, with a gritty texture.

Dark, coarse-grained, and composed chiefly of hornblende.

Coarse grained and abundant in plagioclase feldspar.

Classic, very coarse-grained igneous texture.

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