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

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

Dark brown to black; polycrystalline zinc ore.

Amphibole group; black, coarse, massive.

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

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

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

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

Pyroxene group; dark green, pure cleaved fragments.

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

Light pink, massive, crystalline, translucent.

Black, high grade, foliated, greasy feel.

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

Clear rhombs showing double refraction.

Good grade, brass-yellow copper ore, massive.

Yellow to orange crystal with a glassy luster and smooth, often transparent appearance.