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Formula: Tl2(Sb,As)10S16
Sulphosalt, sartorite group,
paramorph of
parapierrotite
Specific gravity: 4.97
Hardness: 3½
Streak: Red-brown
Colour: Greyish black
Environments
Localities
At the type locality, Jas Roux, La Chapelle-en-Valgaudemar, Hautes-Alpes, Provence-Alpes-Côte d'Azur, France, pierrotite occurs as polycrystalline aggregates in
quartz veins in a hydrothermal deposit in limestone. Associated minerals include
stibnite, realgar, pyrite and
amorphous Tl(As,Sb)10S10
(AM 57.1909-1910, Mindat, HOM).
At Allchar, Rožden, Kavadarci Municipality, North Macedonia, pierrotite is associated with chabournéite and
parapierrotite
(HOM).
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