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Gonnardite


Gonnardite : Na2Ca[Al2Si3O10]2 · 7H2O

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Locality: Alum Mountain District, Grant Co., New Mexico, USA
Hemispherical white gonnardite crystal cluster 15 mm diameter on pocket-filled basalt matrix. Two internal zones fluoresce blue-white under UV illumination. With old Ray DeMark label. Ex. A. Stevenson collection #692. Overall size of mineral specimen: 25x22x12 mm. Size of individual crystals: 6 mm.

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