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Very large 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 fluorescent, red ruby crystals which characterize some of the specimens from this find. In addition, the crystal does have some areas of good luster and semi-translucency, which is unusual for the larger crystals. 3.7 x 1.6 x 1.3 cm.
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