"Freeze-Dried Specimens"

Spinel group; black, dull metallic luster; common iron oxide.

Pyroxene group; gray-green, coarse crystalline.

Feldspar group; white to gray, sodium plagioclase cleavages; some faces may show twinning.

Deep purple crystal clusters.

Bright blue crystalline veins and coatings in a matrix of mixed copper ore.

Cut black mica cleavage sheets.

Bright metallic cubic cleavages; lead ore.

Clear, pure cleavages, Mohs’ hardness of 2.

Good grade, bronze-colored ore, massive.

Feldspar group; greenish gray alkali feldspar, coarse crystalline, some iridescence.

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

Amphibole group; black, coarse, massive.

Black, Micaceous, glittery metallic.

Shiny crystal clusters and crystalline groups, this 'fools gold' is brassy and leaves a black streak.

Feldspar group; good cleavages of pure soda lime feldspar; most show twinning and labradorescence.

Amphibole group; dark greenish black cleavages, somewhat columnar.