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Identity Helpproustite or xanthoconite?

23rd May 2012 19:39 UTCFerdinando Giovine

I don't know well this group. Sample is from Imiter.

This fishtail twinning is a classic for monoclinic minerals and is possible that it is xanthoconite, but the crystals are striped as is well know for proustite. I need help.

Grazie

23rd May 2012 20:01 UTCRob Woodside 🌟 Manager

Those are proustite. Those v twins are common in proustite and pyrargyrite.

23rd May 2012 20:34 UTCLefteris Rantos Expert

Completely agree.

24th May 2012 05:31 UTCFerdinando Giovine

Know you the twins plane?

24th May 2012 15:57 UTCDonald Peck

There are two twin planes common for Proustite: (10-14) and (10-11). The axial lengths are a=10.79 and c=8.69 So, since the angle between the twins is rather acute I would guess that the twin plane is (10-11).

25th May 2012 19:56 UTCFerdinando Giovine

Thank you everyone
 
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