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Dalnegroite

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SKY660088

Dalnegroite

Type Locality

Description Tabs

Description
Locality: 
Lengenbach Quarry, Binntal, Valais, Switzerland
Class: 
Crystals on Matrix
Size Range: 
Micromount (under 1cm)
Size: 
0.1 × 0.1 × 0.1 cm
Description

Acicular perfect black crystal of the extremely rare and relatively new mineral dalnegroite (IMA 2009-058)  from the type and only known locality worldwide, in a tiny matrix of crystallized realgar. Analyzed specimen (EDX and XRD) by F.Nestola, see copy of the analysis attached.

Official Code Number L27.323 from 1996. Ex.M.Ecker and T.Raber collections. 

Very few specimens known, maybe two "big samples" or a few more, being this tiny specimen a part of the two known specimens.

Extreme and very sought after rarity from Lengenbach.

Mineral Data
What's on the rock

Dalnegroite

Formula: 
(Tl4Pb2)(As12Sb8)S34
Strunz: 
2.HC.05e
Hardness: 
3.0 - 3.5
Colour: 
red
Type Locality: 
Lengenbach Quarry, Fäld (Imfeld; Im Feld; Feld), Binn Valley, Wallis (Valais), Switzerland

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