Sulphosalt, sartorite group
Streak: Brownish black
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).
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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