Boscardinite

boscardinite

zinkenite

smithite

stibnite

Images

Formula: TlPb4(Sb7As2)Σ=9S18
Sulphosalt, sartorite group, thallium-, antimony- and arsenic- bearing mineral
Specific gravity: 5.355 calculated
Streak: Black
Colour: Lead-grey
Environments

Sedimentary environments
Metamorphic environments
Hydrothermal environments

Boscardinite was found on a museum specimen in the mineralogical collection of the Museo di Storia Naturale e del Territorio, Pisa, Italy, and it was approved as a new mineral in 2011.

Localities

At Jas Roux, La Chapelle-en-Valgaudemar, Gap, Hautes-Alpes, Provence-Alpes-Côte d'Azur, France, boscardinite is associated with stibnite and smithite (HOM).

At the type locality, the Monte Arsiccio mine, Sant'Anna di Stazzema, Stazzema, Lucca Province, Tuscany, Italy, in the barytepyrite-iron oxides deposit, metamorphic rocks outcrop through non-metamorphic sedimentary formations. The deposit is characterised by a distinct zoning, with pyrite and baryte at the bottom, and iron oxides (magnetite and hematite) and baryte at the top, with accessory sulphides and sulphosalts. The mineralisation is hosted at the contact between phyllite and dolostone.
Boscardinite was identified in a sample occurring in a quartz vein embedded in dolostone, associated with zinkenite. Other sulphosalts identified in the veins crosscutting the dolostone were mercury-rich andorite, boulangerite, chabournéite, jamesonite, robinsonite and zinkenite.
Boscardinite occurs as a millimeter-sized lead-grey mass with a metallic lustre (CM 50.235-251).

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