Mineral: Opal-AN (variety hyalite)
Locality: Zacatecas (City), Municipio Zacatecas, Zacatecas, Mexico
Dimensions: 45 mm x 21 mm x 17 mm

Description: Fluorescet in yellowish green in both UV SW and LW. Here photographied under UV LW. Most Common Activator: (UO2)2 (Uranyl ion) as impurities.

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