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Chemical composition -- An oxide of aluminum and boron with fluorine and hydroxyl.

Color -- Colorless to pale blue-green or yellow-brown.

Optics -- R.I 1.64-1.65.

Durability -- Hardness 6.5-7.5.

Crystal structure -- Hexagonal.

Specific Gravity -- 3.28-3.31.

Sources -- Namibia is almost the only source of this rare gemstone. Jeremejevite is an extremely rare collector stone.

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