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

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

Massive, chlorite-rich.

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

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.

Unusual glassy tubes of fused sand produced by lightning strikes in desert sediments. Average size: 1.5"- 2".

Shiny black volcanic glass showing conchoidal fracture and some spherulites.