Jasrouxite

jasrouxite

smithite

realgar

boscardinite

Images

Formula: Ag16Pb4(Sb25As15)Σ40S72
Sulphosalt, lillianite homologous series group, silver-, antimony- and arsenic- bearing mineral
Crystal System: Triclinic
Specific gravity: 4.87 calculated
Streak: Grey
Colour: Dark grey
Environments

Metamorphic environments
Hydrothermal environments

Jasrouxite is a relatively new mineral, approved in 2012 and to date (May 2023) reported only from the type locality.

Localities

The type locality, Jas Roux, La Chapelle-en-Valgaudemar, Gap, Hautes-Alpes, Provence-Alpes-Côte d'Azur, France, is a thallium-rich sulphosalt deposit in a sedimentary series. Jasrouxite belongs to the early lead-containing stages of the thallium-arsenic-antimony period of mineralisation. It occurs in a silicified gangue, along with smithite and late realgar. Jarouxite forms dark grey anhedral grains with metallic lustre, up to several millimeters in size, as well as aggregates of grains which range to more than 10 mm in diameter. Grains of jasrouxite are coated by a three-phase myrmekite aggregate (an intergrowth of plagioclase feldspar and vermicular quartz), composed of stibnite, baumhauerite-boscardinite and smithite (EJM 25.1031–1038, HOM).

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