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Enneasartorite & Hendekasartorite & Argentobaumhauerite

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SKY752667

Enneasartorite & Hendekasartorite & Argentobaumhauerite

Type Locality

Description Tabs

Description
Locality: 
Lengenbach Quarry, Binntal, Valais, Switzerland
Class: 
Crystals on Matrix
Size Range: 
Small miniature (3-4.5 cm)
Size: 
4 × 2.5 × 1.5 cm
Description

Outstanding sharp metallic crystal of enneasartorite, hendekasartorite and argentobaumhauerite, three extremely rare minerals from the Lengenbach quarry (IMA 2015-074 and IMA 2015-075, the first two)  All three species have been analyzed by EDX (see analysis by Dr. Topa of the NHM Wien , ref. HG370).

Complete analysis (shown in the photos and more) will be sent to the buyer of the specimen.

Enneasartorite and hendekasartorite are two new members of the sartorite group minerals, also of recent creation.

Three extreme Lengenbach rarities in a single specimen!!.

For a discussion of these two new minerals (and also a third one) see :

Topa,D.,Berlepsch,P.,Makovicky,E., Stroeger, B. and Stanley, C. (2015) Enneasartorite, IMA 2015-074,Hendekasartorite, IMA 2015-075. CNMNC Newsletter No. 28, December 2015, page 1861; Mineralogical Magazine, 79, 1859–1864.

and also the text of the original announcement below:

February 9, 2016 - The approval by the CNMNC of three new sulfosalts from Lengenbach has just been announced. The three new minerals  heptasartorite, enneasartorite and hendekasartorite are all - as their name says - members of a "subgroup' of the sartorite homologous series. In the course of systematic investigations Dr.Dan Topa (the main authour) has observed a systematic correlation between the amount of Tl in "sartorite" and the crystal structure. At a few critical values of Tl content the crystal structure tilts into a new one, leading to a new species. "Sartorite" is now the designation for a group of minerals. As it is the case for most of the prismatic, grey Lengenbach Pb sulfosalts a distinction between the new minerals is only possible with thorough analytical investigations

Mineral Data
What's on the rock

Enneasartorite

Formula: 
Tl6Pb32As70S140
Group Parent: 
Sartorite
Crystal System: 
Monoclinic
Type Locality: 
Lengenbach Quarry, Binn Valley, Wallis, Switzerland

Hendekasartorite

Formula: 
Tl2Pb48As82S172
Crystal System: 
Monoclinic
Type Locality: 
Lengenbach Quarry, Fäld (Imfeld; Im Feld; Feld), Binn Valley, Wallis (Valais), Switzerland

Argentobaumhauerite

Formula: 
Pb11Ag(As,Sb)18S36
Strunz: 
2/E.24-15
Crystal System: 
Monoclinic
Hardness: 
3
Colour: 
Steel grey
Type Locality: 
Lengenbach Quarry, Wallis, Switzerland

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