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Geffroyite

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SKY919713

Geffroyite

Rare Mineral

Description Tabs

Description
Locality: 
Moctezuma Mine, Moctezuma, Moctezuma Municipality, Sonora, Mexico
Class: 
Crystals on Matrix
Size Range: 
Thumbnail (1-3cm)
Size: 
2.7 × 2.5 × 1.3 cm
Description

Silvery metallic crystal aggregates of the very rare Cu-Fe-Ag selenide geffroyite from the famous Moctezuma mine in  Mexico famous for its Te minerals. Curiously this one is not a telluride but a selenide. 

Ex Vandenbroucke Museum collection from Waregem, Belgium.

 

Mineral Data
What's on the rock

Geffroyite

Formula: 
(Cu,Fe,Ag)9(Se,S)8
Strunz: 
2.BB.15
Hardness: 
2.5
Type Locality: 
Chaméane Uranium Deposit, Chaméane, Sauxillanges, Puy-de-Dôme, Auvergne, France

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