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Stalderite & Ralphcannonite

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SKY634709

Stalderite & Ralphcannonite

Type Locality

Description Tabs

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

Tiny black crystal of the extremely rare Lengenbach minerals stalderite-ralphcannonite (this one, new species: IMA 2014-077) in a small matrix of realgar.

Stalderite and ralphcannonite form a series, where stalderite is the Cu-end member and ralphcannonite is the Ag-end member. This crystal was analyzed by EDX and it is stalderite (61%) and ralphcannonite (39%), see copy of the analyses included. It is a similar series as hatchite-wallisite, also from Lengenbach.

In addition, this specimen is a part of the type specimen of ralphcannonite (!), that is, the specimen that was used for the description of the species ! Only very few specimens known of both species. After the book "Faszination Lengenbach (2008)" we know that the total number of stalderite specimens known was only 9 !.

Specimen found in 1989.

Stalderite and ralphcannonite have only been found in Lengenbach worldwide.

Don't miss the opportunity to get these two extreme rarities from Lengenbach !!.

Mineral Data
What's on the rock

Stalderite

Formula: 
Tl(Cu,Ag)(Zn,Fe,Hg)2(As,Sb)2S6
Strunz: 
2.GA.40
Crystal System: 
Tetragonal
Hardness: 
3.5 - 4.0
Streak: 
Brown-red
Type Locality: 
Lengenbach Quarry, Fäld (Imfeld; Im Feld; Feld), Binn Valley, Wallis (Valais), Switzerland

Ralphcannonite

Formula: 
AgZn2TlAs2S6
Crystal System: 
Tetragonal
Colour: 
Black
Type Locality: 
Lengenbach Quarry, Binntal, Wallis, Switzerland

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