Mineral Specimens

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

Cleaned, pure, bright, metallic native copper.

Clear, pure cleavages, Mohs’ hardness of 2.

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

Deep blue, massive, with nepheline; key feldspathoid.

Pure kaolinite powder, 200 mesh.

Amphibole group; black, coarse, massive.

Brown, fluorescent crystals intergrown in dolomite rock.

White, fine, massive, opaque to slightly translucent.

Pure, white, earthy “China clay”.