Mineral: Hydrothermally Grown Synthetic Silicon Dioxide
Description: R&D XTALS LLC, Cleveland, Cuyahoga Co., Ohio, United States 4.5 cm x 2.5 cm x 3 cm This specimen (JKB766) is a classic example of a “Vlad Twin” or “V-Twin”. These twins are thicker than natural Japan-law twin crystals.

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