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Mex019 - Buergerite and Hyalite Opal - Mexquitic, San Luis Potosi, Mexico
Mex019 - Buergerite and Hyalite Opal - Mexquitic, San Luis Potosi, Mexico
Excellent cabinet specimen of this rare toumaline from the type locality.  The Worldwide Mineral label dates the specimen to August 1962 and also has a handwritten summary of the XRD analysis on the reverse.  The buergerite crystals measure to 7 mm and have sharp terminations and fine luster.  A few crystals show minor damage under 10x magnification.  The large crystal at the top right is undamaged - the lighter portion is a natural growth of hyalite.  10.5 x 6.1 x 1.9 cm.
 
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Price: $175.00
126.32 £104.11 ¥17,881
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