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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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