Exceptional cube of the rare niobium-containing species Lueshite, with good metallic luster and typical back-silver color. What makes this so grand is the size and, most especially, the sharpness of the crystal. I am told that these came out only sporadically, and mostly 20-plus years ago. This is the largest I have had for sale out of several over the years. It is a significant example for the species. .6 x .6 x .6 cm
Attribution: Rob Lavinsky, iRocks.com – CC-BY-SA-3.0
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