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Chemical composition -- Lithium aluminum silicate.

Color -- Colorless to pale yellow or pink.

Optics -- R.I 1.50-1.52.

Durability -- Hardness 6-6.5. Brittle.

Crystal structure -- Monoclinic.

Specific Gravity -- 2.3-2.5.

Sources -- Zimbabwe, Namibia, Australia, Brazil. Petalite owes its limited desirability to rarity, but it deserves a place in collections, especially in larger sizes.

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