Mineral: Meta-autunite
Locality: Les Oudots Quarry, Grury, Issy-l'Evêque, Autun District, Saône-et-Loire, Bourgogne-Franche-Comté, France
Dimensions: 25 x 20 x 7 cm / main crystal: 0.7 cm

Description: Mass: 2450 g MIM number: 1379 Crust of tabular crystals, fluorescent green-yellow under long UV rays, covering the top of a granite plate. The latter separated naturally from the granite like several others, and water circulating between the interstices has dissolved and deposited autunite in these fissures. Photographer: AINU / Augustin de Valence; Ex collection: Université Pierre et Marie Curie (France)

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