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Chemical composition -- Beryllium silicate.

Color -- Colorless or faintly colored by impurities.

Optics -- R.I 1.65-1.67.

Durability -- Hardness 7.5-8. Brittle.

Crystal structure -- Hexagonal.

Specific Gravity -- 2.93-3.00.

Sources -- Phenakite occurs in many locations and may be found in very large pieces; the best sources include Brazil and the Ural Mountains. Finished stones are very brilliant though low in dispersion.

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