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Chemical composition -- A hydrated sodium aluminum phosphate.

Color -- Very light to medium tones of yellow or yellow-green.

Optics -- R.I 1.60-1.62.

Durability -- Hardness 5.5. Brittle. A little too fragile for most jewelry use.

Crystal structure -- Monoclinic.

Specific Gravity -- 2.98-3.0.

Sources --Brazil is the sole source of gem material. Although some large stones have been cut, most are under 5 carats.

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