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Clear, pure cleavages, Mohs’ hardness of 2.

Light gray, compact, hard, opaque, microcrystalline silica mineral.

Amphibole group; black, coarse, massive.

Feldspar group; pink cleavages showing perthitic texture, common potassium feldspar, Mohs’ hardness of 6.

Cleaned, pure, bright, metallic native copper.

Pure kaolinite powder, 200 mesh.

Black, Micaceous, glittery metallic.

Deep blue, massive, with nepheline; key feldspathoid.

Bright metallic cubic cleavages; lead ore.

Great for geology hardness tests.