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Autunite & Torbernite

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TPX1065229

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Description
Locality: 
Margabal Mine, Entraygues-sur-Truyère, Aveyron, Occitanie, France
Class: 
Crystals on Matrix
Size Range: 
Small cabinet (7-10 cm)
Size: 
7 × 4.5 × 4.3 cm
Weight: 
135.00gr
Description

Very nice and aesthetic specimen formed by a rich group of autunite and torbernite partially transformed to meta-autunite and metatorbernite crystals with the characteristic yellow and  green color. Under LW-UV we can observe the presence of a greenish-yellow intense fluorescence that indicates the presence of autunite and meta-autunite. I think 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. This specimen come from late 90's finds in this classic French mine. Ex-col. Guy Majoulet
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.

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220 ($240.60)
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Start 05 Mar 18:00
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