"Classroom Mineral Specimens"

Pyroxene group; dark green, pure cleaved fragments.

Pure translucent to white, rhombic cleavages, Mohs’ hardness of 3.

Deep blue, massive, with nepheline; key feldspathoid.

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

White, fibrous, silky luster.

Feldspar group; calcium end member plagioclase crystals in pyroxene matrix.

White, fine, massive, opaque to slightly translucent.

Feldspar group; good cleavages of pure soda lime feldspar; most show twinning and labradorescence.

Amphibole group; dark greenish black cleavages, somewhat columnar.

Fresh Green forsterite, classic “twin sisters” dunite.

Amphibole group; black, coarse, massive.

Cleaned, pure, bright, metallic native copper.

Pure, white, earthy “China clay”.

Spinel group; black, dull metallic luster; common iron oxide.

Brown, earthy, massive; used for yellow pigment.

Brown, fluorescent crystals intergrown in dolomite rock.