Écrinsite

ecrinsite

jasrouxite

guettardite

chabourneite

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Formula: AgTl₃Pb₄As₁₁Sb₉S₃₆
Sulphosalt, sartorite group, silver-, thallium-, lead-, arsenic- and antimony- bearing mineral
Crystal System: Triclinic
Specific gravity: 4.96 calculated
Hardness: 3 to 3½
Environments

Hydrothermal environments

Écrinsite is a relatively new mineral, approved in 2016.

Localities

At the type locality, Jas Roux, La Chapelle-en-Valgaudemar, Gap, Hautes-Alpes, Provence-Alpes-Côte d'Azur, France, écrinsite is found in the arsenic – antimony – lead – thallium – mercury – silver deposit. Associated minerals include jasrouxite, stibnite, smithite, guettardite, chabournéite, pierrotite and arsenic-bearing zinkenite. Écrinsite is opaque with a metallic lustre (EJM 29.689-700). The écrinsite occurs in a low temperature hydrothermal environment as anhedral crystal aggregates up to 400 µm in size and only one crystal aggregate >1.5 mm across has been found. It rarely forms prismatic crystals with complex forms (Mindat).

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