"Freeze-Dried Specimens"

Clear to yellow translucent.

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

Classic “peacock” aluminum ore.

Small 1–1.5 mm crystal, octahedrans or cubes, Mohs” hardness of 10.

Classic, white chalk, massive; from Cliffs of Dover, England.

Great for geology hardness tests.

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.

A textbook example of pure crystalline carbon which is extermely soft.

Dark brown to black; polycrystalline zinc ore.

Exemplary display of hexoctahedral crystal shape.