Moving mountains for you
Switch currency

Current Live Auctions

Current Live Fixed Price Sales

Torbernite

Views:
Watches:
TPX1061989

Torbernite

Radioactive

Description Tabs

Description
Locality: 
Margabal Mine, Entraygues-sur-Truyère, Aveyron, Occitanie, France
Class: 
Crystal Group/Cluster
Size Range: 
Thumbnail (1-3cm)
Size: 
2.5 × 2.2 × 1.7 cm
Weight: 
20.00gr
Description

Very nice and aesthetic specimen formed by a rich group of torbernite partially transformed to 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. 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. Alain 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.

Mineral Data
What's on the rock

Torbernite

Formula: 
Cu(UO2)2(PO4)2·12H2O
Strunz: 
8.EB.05
Crystal System: 
Tetragonal
Hardness: 
2.0 - 2.5
Type Locality: 
Johanngeorgenstadt, Johanngeorgenstadt District, Erzgebirge, Saxony, Germany

Seller Information

Payment options: offline, paypal_wpp, paypal_wps