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Identity HelpBlack coating on kesterite + mushistonite from Pingwu
11th Apr 2021 04:02 UTCLuís Martins 🌟
The back of the specimen shows a black coating over the mushistonite that does not come off with a gentle mechanical scrub. Photo attached, showing the specimen (4cm wide).
Any ideas on what this is? I cannot seen anything similar in the photos from this locality.
12th Apr 2021 05:02 UTCPavel Kartashov Manager
According to my analytical data such black films are fine mixtures of chalcocite group minerals and acanthite.
By the way, and this mushistonite quite able to be vismirnovite.
12th Apr 2021 05:34 UTCLuís Martins 🌟
What test would be able to distinguish between mushistonite and vismirnovite? Would EDS suffice?
12th Apr 2021 14:23 UTCPavel Kartashov Manager
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Copyright © mindat.org and the Hudson Institute of Mineralogy 1993-2024, except where stated. Most political location boundaries are © OpenStreetMap contributors. Mindat.org relies on the contributions of thousands of members and supporters. Founded in 2000 by Jolyon Ralph.
Privacy Policy - Terms & Conditions - Contact Us / DMCA issues - Report a bug/vulnerability Current server date and time: April 26, 2024 05:18:50