Taafeite

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Chemical composition -- Beryllium magnesium aluminate with additional metals.

Color -- Mauve, reddish violet, brownish-purple, pink, red, blue.

Optics -- R.I 1.71-1.72.

Durability -- Hardness 8-8.5.

Crystal structure -- Hexagonal.

Specific Gravity -- 3.60-3.71.

Sources -- Taafeite is one of the rarest and most desirable of collector's stones. Only a very few stones have been found, most of them originally misidentified as spinel, and Sri Lanka (Ceylon) appears to be the only known source.

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