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Mineralogical ClassificationAcanthite psm argentite vs acanthite

19th Aug 2016 17:40 UTCpenney file (2)

I have a decent number of specimens of acanthite, mostly Moroccan. Some are matte dull gray in appearance, some are more shiny or lustrous. I am curious as to whether or not the difference can be attributed to acanthite that formed directly at low temperature versus acanthite formed as argentite cooled and morphed into acanthite. Appreciate all insights.

19th Aug 2016 18:35 UTCAlfredo Petrov Manager

Depends on the apparent crystal shape?

19th Aug 2016 20:19 UTCReiner Mielke Expert

Primary acanthite looks like this: http://www.mindat.org/photo-354969.html Acanthite pseudomorph argentite looks like this: http://www.mindat.org/photo-386752.html and secondary acanthite looks like this: http://www.mindat.org/photo-2733.html
 
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