"WardsSci000444"

Bright metallic cubic cleavages; lead ore.

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

Nearly pure, green crystalline forsterite.

Brown, fluorescent crystals intergrown in dolomite rock.

Brown, earthy, massive; used for yellow pigment.

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

Clear, pure cleavages, Mohs’ hardness of 2.

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

Amphibole group; black, coarse, massive.

Good grade, brass-yellow copper ore, massive.

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

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

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

Black, high grade, foliated, greasy feel.

Clear, euhedral points and sections.

Light pink, massive, crystalline, translucent.