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Autunite

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TPX1062035

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Description
Locality: 
Margabal Mine, Entraygues-sur-Truyère, Aveyron, Occitanie, France
Class: 
Crystal Group/Cluster
Size Range: 
Small miniature (3-4.5 cm)
Size: 
3.5 × 3.3 × 2 cm
Weight: 
24.00gr
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.

Mineral Data
What's on the rock

Autunite

Formula: 
Ca(UO2)2(PO4)2·11H2O
Strunz: 
8.EB.05
Crystal System: 
Tetragonal
Hardness: 
2.0 - 2.5
Type Locality: 
Saint-Symphorien-de-Marmagne, Montcenis, Saône-et-Loire, Burgundy, France

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