A prismatic emerald crystal within a rock crystal quartz. Photomicrograph by Nattida Ng-Pooresatien; field of view 12.5 mm. Rock crystal is a transparent and colorless macrocrystalline variety of ...
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At the AGTA show, Rare Earth Mining Co. (Trumbull, Connecticut) offered a vast array of fine and unusual gem materials unavailable anywhere else in the trade. Among the opalized wood, Tiffany stone, ...
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