"Classroom Mineral Specimens"

Blue fluorapatite, pure crystalline, Moh's hardness of 5.

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

Feldspar group; greenish gray alkali feldspar, coarse crystalline, some iridescence.

Cut black mica cleavage sheets.

Deep blue, massive, with nepheline; key feldspathoid.

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

White, fibrous, silky luster.

White, fine, massive, opaque to slightly translucent.

Fresh Green forsterite, classic “twin sisters” dunite.

White, massive, coarse crystalline vein, Mohs’ hardness of 7.

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

Amphibole group; dark greenish black cleavages, somewhat columnar.

Pure, white, earthy “China clay”.

Cleaned, pure, bright, metallic native copper.

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

Good grade, green, massive; copper ore.