"Classroom Mineral Specimens"

Brown, earthy, massive; used for yellow pigment.

Brown, fluorescent crystals intergrown in dolomite rock.

Clear, pure cleavages, Mohs’ hardness of 2.

Spinel group; iron-black, massive; natural magnet.

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

Good grade, brass-yellow copper ore, massive.

Red, earthy, in natural chunk form; common pigment ore.

Feldspar group; white-to-gray cleavages of sodic plagioclase; some show twinning.

Clear, euhedral points and sections.

Black, high grade, foliated, greasy feel.

Light pink, massive, crystalline, translucent.

Coarse, 'salt and pepper': dark pyroxene and light andesine. Provides perfect representation of an intermediate igneous rock.

Pure, large, transparent-to-translucent cleavages, Mohs’ hardness of 4.

Deep purple crystal clusters.

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

Clear rhombs showing double refraction.