Protochabournéite

protochabourneite

boscardinite

realgar

routhierite

Images

Formula: Tl4-xPb2+2xSb20-x-yAsyS34
0.02 ≤ x ≤ 0.34, 5.71 ≤ y ≤ 6.69
Sulphosalt, thallium-, antimony- and arsenic- bearing mineral
Crystal System: Triclinic
Specific gravity: 5.083 calculated
Streak: Black
Colour: Black
Environments

Sedimentary environments
Hydrothermal environments

Protochabourneite is a relatively new mineral, approved in 2011 and to date (September 2023) reported only from the type locality.

Localities

At the type locality, the Sant'Olga tunnel, Monte Arsiccio Mine, Sant'Anna di Stazzema, Stazzema, Lucca Province, Tuscany, Italy, protochabournéite was identified in two samples. In the holotype specimen, it occurs in quartz - dolomite - baryte veins embedded in dolostone, associated with pyrite, realgar, sphalerite and stibnite. In these two specimens, protochabournéite occurs as black compact masses, up to 1 cm wide.
New samples were identified as veinlets embedded in pyrite-rich dolostone, and associated with boscardinite, routhierite, mercury-rich sphalerite, stibnite, twinnite, and an unidentified thallium - antimony - sulphur phase (CM 51.475-494).

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