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Formula: Pb(Sb0.63As0.37)2S4
Sulphosalt, sartorite group
Crystal System: Monoclinic
Specific gravity: 5.323 calculated
Hardness: 3½
Streak: Brownish black
Colour: Black
Environments:
Metamorphic environments
Hydrothermal 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
chabournéite, pierrotite,
parapierrotite, stibnite,
pyrite, sphalerite,
zinkenite, madocite,
andorite, smithite,
laffittite, routhierite,
aktashite, wakabayashilite,
realgar and orpiment
(HOM).
Twinnite from Jas Roux - Image
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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