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proustite or xanthoconite?

Posted by Ferdinando Giovine

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Ferdinando Giovine

proustite or xanthoconite?
May 23, 2012 06:39PM

Registered: 3 years ago
Posts: 175

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

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open | download - Proustite xx geminati, Imiter Marocco, ex Daniele Alberti.jpg (55.7 KB)

Rob Woodside

Re: proustite or xanthoconite?
May 23, 2012 07:01PM

Registered: 7 years ago
Posts: 4,874

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

Edited 1 time(s). Last edit at 05/23/2012 07:43PM by Rob Woodside.

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Lefteris Rantos

Re: proustite or xanthoconite?
May 23, 2012 07:34PM

Registered: 7 years ago
Posts: 791

Completely agree.

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Ferdinando Giovine

Re: proustite or xanthoconite?
May 24, 2012 04:31AM

Registered: 3 years ago
Posts: 175

Know you the twins plane?

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Donald Peck

Re: proustite or xanthoconite?
May 24, 2012 02:57PM

Registered: 5 years ago
Posts: 1,168

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).

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Ferdinando Giovine

Re: proustite or xanthoconite?
May 25, 2012 06:56PM

Registered: 3 years ago
Posts: 175

Thank you everyone

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