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RM963   Metatorbernite with meta-autunite and smoky quartz

Margabal mine, Entraygues-sur-Truyère, Aveyron, Midi-Pyrénées, France

A very aesthetic specimen formed by a rich group of metatorbernite crystals. They present polysynthetic and echeloned growth of well-defined tetragonal crystals, with the characteristic green color. Under LW-UV we can observe the presence of a greenish-yellow intense fluorescence that indicates the presence of other species. SEM-EDS analysis have characterized this species as meta-autunite. We can say that the metatorbernite species is replacing the meta-autunite, as we can observe as a color gradation in some tabular crystals or in fresh fracture. We will send analysis to the buyer. With smoky quartz as host rock and matrix. This specimen come from late 90's finds in this classic French mine. Ex-col. A. Pouget.

Both, meta-autunite and metatorbernite, are dehydrated phases of the autunite and torbernite. The loss of water molecules, those are present in the crystal structure of these species, is a common fact when the specimen is extracted from the mine.

Size: 8.7 x 4.8 x 3.8 cm.
Main crystal: 10 x 9 mm.
Found in ca. 1997.

Especies analizadas/Analyzed species
Fluorescent under long wave UV