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Identity Helpunknown secondary mineral from Cleator, AZ (David Shannon material)

16th Feb 2026 17:33 UTCAndrew Hodgson OP

04854860017712632171081.jpg
Hi, 
This might be a long shot, and the specimen will certainly need some conclusive analysis, but I was wondering if anyone has similar material on a specimen of theirs.  It's a typical specimen of Cleator Ferrimolybdite (photo here: ).  On the reverse of the specimen, in the quartz is an unusual green secondary phase. Some is waxy and amorphous-looking, while some is well crystallised (albeit in tiny submillimetric crystals).  Only chalcopyrite is listed as a Cu mineral from the mine, so I'm puzzled.  It doesn't really look like lindgrenite, which would be the most obvious choice based on chemistry.  Any ideas are welcome.  FoV is around 2mm.
Thanks, Andrew


Questions Answered
Can it scratch glass? : Unable to test
Can you scratch it with your fingernail? : Unable to test
Is it light/heavy for the size? : Unable to test

16th Feb 2026 17:51 UTCRobert Jewell

Peridotite?
It can look more or less like crystals depending on the mix of materials. I think it’s olivine and something else I’m blanking on the name right now. 

16th Feb 2026 17:56 UTCKnut Eldjarn 🌟 Manager

Try a UV-lamp. Could it be cuprian powellite ??

16th Feb 2026 17:59 UTCAndrew Hodgson OP

Interesting - thanks Knut.

16th Feb 2026 20:15 UTCHerwig Pelckmans

Try a UV-lamp. Could it be cuprian powellite ??
 I doubt that cuprian powellite will fluoresce, since Cu is a fluorescence killer ...
but sometimes it all depends on the concentration ...

16th Feb 2026 17:59 UTCAndrew Hodgson OP

I forgot the specimen link...

16th Feb 2026 20:46 UTCAndreas Schloth Expert

Maybe a member of the Heteropolymolybdate group. Obradovicite e.g. can have a similar appearance.

16th Feb 2026 22:35 UTCHerwig Pelckmans

Heteropolymolybdate group
 Seems like that one needs to be added to the dictionary ... can not find that group on mindat.

12th May 2026 02:13 UTCNoah Horwitz 🌟

@Herwig Pelckmans it is not a group of minerals but a chemical group, basically a big ball of molybdenum and oxygen atoms (with at least one different atom, hence "hetero") forming an anion or cation.  See https://en.wikipedia.org/wiki/Polyoxometalate for more information.

12th May 2026 02:58 UTCHerwig Pelckmans

@Noah Horwitz I know, but thanks for specifying!
 I should have been more clear:
This chemical group is not in the mindat glossary, so if someone could add it, that would be nice. Noah already provided the text ... :-)

10th May 2026 19:02 UTCAndrew Hodgson OP

Here's an updated photo, taken at higher magnification, so some crystal faces are visible, although it's not a great photo.
Does the crystal form match obradovicite minerals, or perhaps something else?
FoV is less than 2mm.

10th May 2026 19:03 UTCAndrew Hodgson OP

02352840017784397509728.jpg
The photo didn't seem to load!

11th May 2026 14:17 UTCA. M.

Maybe chlorargyrite, although its color is quite bright?
 
and/or  
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