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Luxembourgite Nickeltyrrellite & Grundmannite

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SKY933530

Luxembourgite Nickeltyrrellite & Grundmannite

Type Locality

Description Tabs

Description
Locality: 
El Dragón Mine, Quijarro Province, Potosi Department, Bolivia
Class: 
Combination
Size Range: 
Small miniature (3-4.5 cm)
Size: 
3 × 3 × 1 cm
Description

Metallic inclusions of the three extremely rare new selenides luxembourgite (IMA 2018-154), grundmannite (IMA 2015-038) and  nickeltyrrellite (IMA 2018-110) from the famous El Dragon mine in Bolivia, known for its paragenesis of selenium minerals in a completely analyzed sample by SEM/EDS, see copies of the analysis enclosed:

Luxembourgite : analysis in photo 3.

Grundmannite: analysis in photo 4.

Nickeltyrrellite:  analysis in photo 5.

Atomic and weight percentages in the analyses are only approximate since the sample was not carbon coated due to a requirement of the SEM/EDS machine.

Type locality for grundmannite and nickeltyrrellite !

Associated minerals are pink ahlfeldite and blue chalcomenite (photo 7)

Don't miss the opportunity to get three extremely rare new selenium minerals in a single specimen !

Mineral Data
What's on the rock

Luxembourgite

Formula: 
AgCuPbBi4Se8
Crystal System: 
Monoclinic
Type Locality: 
Bivels, Putscheid, Canton Vianden, Luxembourg
Isostructural with: 
Watkinsonite
Litochlebite

Nickeltyrrellite

Formula: 
CuNi2Se4
Crystal System: 
Isometric
Colour: 
Black
Type Locality: 
El Dragón mine, Porco Municipality, Antonio Quijarro Province, Potosí, Bolivia
Isostructural with: 
Tyrrellite

Grundmannite

Formula: 
CuBiSe2
Crystal System: 
Orthorhombic
Hardness: 
2 - 2½
Colour: 
Black
Streak: 
Black
Type Locality: 
El Dragón Mine, Potosí Department, Bolivia
Isostructural with: 
Emplectite

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