Classroom Minerals

Crystals and crystal sections up to 1", Mohs’ hardness of 9.

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

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

Amphibole group; black, coarse, massive.

Cleaned, pure, bright, metallic native copper.

Pure kaolinite powder, 200 mesh.

Black, Micaceous, glittery metallic.

Bright metallic cubic cleavages; lead ore.

Deep blue, massive, with nepheline; key feldspathoid.

Deep purple crystal clusters.