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Dark brown to black; polycrystalline zinc ore.

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

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

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

Amphibole group; black, coarse, massive.

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

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

Brownish gray, translucent.

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

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

Light pink, massive, crystalline, translucent.

Black, high grade, foliated, greasy feel.

Pyroxene group; dark green, pure cleaved fragments.

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

Feldspar group; white to gray, sodium plagioclase cleavages; some faces may show twinning.

Clear rhombs showing double refraction.