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Formula: Pb(Sb0.63As0.37)2S4
Sulphosalt, sartorite group
Specific gravity:
Hardness: 3½
Streak: Brownish black
Colour: Black
Environments:
Localities
At the type locality, the Taylor Pit, Huntingdon Township, Madoc area, Hastings County, Ontario, Canada, twinnite occurs in
marble with other lead sulphantimonides
(HOM).
At Jas Roux, La Chapelle-en-Valgaudemar, Hautes-Alpes, Provence-Alpes-Côte d'Azur, France, twinnite is associated with
chabourneite, pierrotite,
parapierrotite, stibnite,
pyrite, sphalerite,
zinkenite, madocite,
andorite, smithite,
laffittite, routhierite,
aktashite, wakabayashilite,
realgar and orpiment
(HOM).
At Novoye, Khaidarkan Sb-Hg deposit, Fergana Valley, Alai Range, Osh Oblast, Kyrgyzstan, twinnite is associated with
sphalerite, pyrite,
galena, playfairite,
sorbyite, guettardite,
baumhauerite, realgar,
orpiment, cinnabar,
fluorite and quartz
(HOM).
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