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proustite or xanthoconite?

Posted by Ferdinando Giovine  
proustite or xanthoconite?
May 23, 2012 06:39PM
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
Attachments:
open | download - Proustite xx geminati, Imiter Marocco, ex Daniele Alberti.jpg (55.7 KB)
avatar Re: proustite or xanthoconite?
May 23, 2012 07:01PM
    
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.
Re: proustite or xanthoconite?
May 23, 2012 07:34PM
    
Completely agree.
Re: proustite or xanthoconite?
May 24, 2012 04:31AM
Know you the twins plane?
avatar Re: proustite or xanthoconite?
May 24, 2012 02:57PM
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).
Re: proustite or xanthoconite?
May 25, 2012 06:56PM
Thank you everyone
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