"Specimens"

Amphibole group; dark greenish black cleavages, somewhat columnar.

Deep purple crystal clusters.

Cut black mica cleavage sheets.

Good grade, brass-yellow copper ore, massive.

White, fine, massive, opaque to slightly translucent.

Clear, pure cleavages, Mohs’ hardness of 2.

White, fibrous, silky luster.

Classic “peacock” aluminum ore.

Feldspar group; white-to-gray cleavages of sodic plagioclase; some show twinning.

Spinel group; iron-black, massive; natural magnet.