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Chemical composition -- Lead chromate.

Color -- Red to orange.

Optics -- R.I 2.29-2.66.

Durability -- Hardness 2.5-3. Brittle.

Crystal structure -- Monoclinic.

Specific Gravity -- 5.9-6.1 (very dense).

Sources -- Tasmania is the best known source of this rare material. The intense red to orange color makes spectacular collector stones, but cutting is difficult.

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