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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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