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Deep purple crystal clusters.

Bright blue crystalline veins and coatings in a matrix of mixed copper ore.

Cut black mica cleavage sheets.

Bright metallic cubic cleavages; lead ore.

Clear, pure cleavages, Mohs’ hardness of 2.

Good grade, bronze-colored ore, massive.

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

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

Classic “peacock” aluminum ore.

Classic, white chalk, massive; from Cliffs of Dover, England.