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Excellent single crystal of this incredibly rare borate, which was considered one of the rarest minerals in the world until the 2005 find at Hinthar Hill. This crystal has an overgrowth of a few fluorescent, red ruby crystals which characterize some of the specimens from this find. In addition, the crystal has great luster, unusual for this find where most larger crystals have a sugary exterior. 2.2 x 1.6 x 1.2 cm.
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