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Gold With Brannerite

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LGM706687

Gold With Brannerite

ex Marcus Lueg personal collection
New Discovery

Description Tabs

Description
Locality: 
Etendard Refuge, La Croix de Fer Pass, Saint-Sorlin-d'Arves, Savoie, Auvergne-Rhône-Alpes, France
Class: 
Crystals on Matrix
Size Range: 
Small miniature (3-4.5 cm)
Size: 
1.5 × 3 × 1.8 cm
Weight: 
9.00gr
Description

This specimen features bright lustrous crystalline gold together with in-grown black brannerite crystals (partly with well-defined faces). The matrix is light smoky quartz. An rare alpine combination!
It is from a quite new discovery at a high-alpine locality, found in 2015 by french stahlers one valley away from well-known La Gardette gold mine. Only a dozen pieces or so were found and the exact locality is still top-secret.

Significantly radioactive due to content of U, Th and/or rare earth elements (appr. 25 micro Sv/h within spitting distance).

Mineral Data
What's on the rock

Gold

Formula: 
Au
Strunz: 
1.AA.05
Crystal System: 
Isometric
Hardness: 
2.5 - 3.0

Brannerite

Formula: 
(U4+,REE,Th,Ca)(Ti,Fe3+,Nb)2(O,OH)6
Strunz: 
4.DH.05
Crystal System: 
Monoclinic - Prismatic
Hardness: 
4.5 - 5.5
Type Locality: 
Kelley Gulch, Stanley, Stanley Basin District, Custer Co., Idaho, USA

Seller Information

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