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

Bright metallic cubic cleavages; lead ore.

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

Dark gray, composed mostly of pyroxene and olivine.

Mica group; cut sheets showing basal cleavages. Books and sheets in bulk pack.

Pink/gray coarse carbonate rock.

Coarse-grained, with microcline, biotite and horblende phenocrysts.

Cut black mica cleavage sheets.

Good grade, bronze-colored ore, massive.

Pale pink felsite, with small sanidine phenocrysts.

Brownish gray, kerogen-rich; commercial oil source.

White, fine, massive, opaque to slightly translucent.

Shiny black volcanic glass showing conchoidal fracture and some spherulites.

Gray, fine, friable, with abundant small sanidine crystal fragments.

Simulated silicone specimen, designed for modern learning.

Glassy; most specimens float in water.