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Identity HelpAzurite from Australia location question

9th Nov 2018 16:04 GMTBrian Gray

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Hello All !!


I have a question for the Australian Mindaters out there or anyone else that can help.


In the early 70's I purchased an Azurite labled only as Australia. I purchased from a mineral shop on the boardwalk of Atlantic City, NJ (long before gambiling). The overall dimensions are apporx. 12 cm x 8 cm x 5 cm. The largest Azurite is @1.5 cm long. There appears to be Azurite covered in some Malachite (visible on some broken areas) and covered by Azurite again. The matrix is a Quartz sandstone (see photos).


Can anyone give me a more definitive location??


Thanks.


Brian Gray


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9th Nov 2018 16:37 GMTBrian Gray

-- moved topic --

10th Nov 2018 12:12 GMTKnut Eldjarn Manager

Brian,


I am not an Australian but have visited the country on many occasions and have many Australian specimens in my collection - especially from Broken Hill. I cannot pin down any location but will comment on the matrix. It looks like a pure quartz-sandstone. I do not se any grains of garnet. At Broken Hill it was quite common to have small grains of garnet in a sandstone-like matrix. Therefore my prime guess for your specimen would not be Broken Hill. But there are other localities in Australia where "common sandstone" is the matrix for Azurites (i.e. Burra Burra). You may look through the images in Mindat of Australian azurites and consider possible alternatives. To be true to science I would not dare label the specimen as originating from a specific Australian locality based on similarities in appearance alone. But you could of course compile the results of your study and keep information about "educated guesses" as for its specific origin with a label stating only "Australia".

Knut

13th Apr 2019 01:47 BSTRocknCrystals

Hi Brian

I'm a little late to the party and you may well have solved this one, but I'd suggest Mineral Hill in NSW is a likely location from the look of the matrix and crystals. I'm not a geo but have been dealing minerals here in Aus for some years. Hope that helps! We have a few similar pieces online for comparison,

Regards

Sarah

13th Apr 2019 08:22 BSTBen Grguric Expert

But Sarah, were Mineral Hill specimens like this one available on the market in the early 1970's? Modern mining didn't start there until 1987. It doesn't look like a Burra piece to me because the usual matrix for Burra azurite specimens is typically brecciated dolomite or claystone. The pink arenite matrix resembles the Pandurra Formation matrix seen in many Mt Gunson specimens, but I've never seen an azurite as good as that from Mt. Gunson. Perhaps there were some??


Brian, see if you can scrutinise the specimen for any other minor phases. Broken Hill azurites sometimes have tiny, waxy yellow or olive green silver halides associated.

13th Apr 2019 09:33 BSTRalph Bottrill Manager

I'm pretty sure its not Burra or Broken Hill, having collected at both.

I don't recall seeing azurite from Mt Gunson.

Possibly Gunpowder in Qld?

Or maybe one of the copper mines in the Arkaroola area, or the Cleve copper mine? There were small amounts of material coming out back then.

13th Apr 2019 14:12 BSTKevin Conroy Expert

Given the sketchy label, this could be from well outside Australia.

9th Oct 2019 16:20 BSTBrian Gray

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No garnets in matrix.  It is a quartz sandstone. 
There is some alteration to malachite.  see photos attached.

9th Oct 2019 16:21 BSTBrian Gray

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Another photo.
 
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