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Tetrahedrite Var Binnite

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QRI633588

Tetrahedrite Var Binnite

Former collection Weibel
With Antique Label

Description Tabs

Description
Locality: 
Lengenbach Quarry, Binntal, Valais, Switzerland
Class: 
Crystals on Matrix
Size Range: 
Miniature (4.5-7 cm)
Size: 
6.4 × 4.8 × 4.1 cm
Largest Crystal: 
0.70cm
Weight: 
142.00gr
Description

An impressively large crystal of jet black binnite is perched onto sugary dolomite marble matrix. The crystal is very lustrous and with some growth patterns along the faces. A few occasional contacts throughout, however not distracting from the significance of the specimen.

The crystal is glued back to its original matrix and - I believe - position. The used glue has turned dark and yellowish, showing that this is a rather old repair. 

This is a very old specimen. It comes with a paper label and two pasted labels (one detached), and they certainly place the specimen to the end of the 19th century period.

Former collection Weibel (Switzerland).

Mineral Data
What's on the rock

Tetrahedrite

Formula: 
Cu6[Cu4(Fe,Zn)2]Sb4S13
Strunz: 
2.GB.05
Hardness: 
3.5 - 4.0

Binnite

Variety Of: 

Tennantite

Formula: 
Cu6[Cu4(Fe,Zn)2]As4S13
Strunz: 
2.GB.05
Hardness: 
3.0 - 4.5

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