Hematite

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Chemical composition -- Iron oxide.

Color -- Very dark brownish red to black.

Optics -- R.I. 2.94-3.22. Polished stones have a metallic luster.

Durability -- Hardness 5-6.5.

Crystal structure -- Hexagonal.

Specific Gravity -- 4.95-5.26.

Sources -- England is the best known supplier. Hematite is often fashioned into carvings, cameos, intaglios , and beads.

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