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2 Unknowns co-occurring with Caledonite, Grand Reef Mine, AZ
  
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cfrench58




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PostPosted: Mar 27, 2024 14:39    Post subject: 2 Unknowns co-occurring with Caledonite, Grand Reef Mine, AZ  

Hello, in the category of "Stump the Chump" I am pulling a blank on identifying two minerals that are co-occurring with a Caledonite TN from Grand Reef. The first occurs as chalk-white botryoidal aggregates. The 2nd unknown is a lustrous grey-violet cryptocrystalline mineral that appears intergrown with the Caledonite. Please see attached. The specimen measures 28 x 18 x 10 mm.

(Photos were taken with Fuji XH-1 glassed with Fuji 80 mm macro, Laowa 50 mm macro and Zhongyi 20 mm super macro. A Cognysis Stackshot was utilized for focus stacking with postprocessing through Capture 1 and Helicon Focus)



2024-03-26 16-41-25 (A,Radius8,Smoothing4).jpg
 Mineral: Caledonite
 Locality:
Grand Reef Mine, Laurel Canyon, Grand Reef Mountain, Klondyke, Aravaipa District, Graham County, Arizona, USA
 Dimensions: 28 x 18 mm
 Description:
Complete thumbnail
 Viewed:  1736 Time(s)

2024-03-26 16-41-25 (A,Radius8,Smoothing4).jpg



macro.jpg
 Mineral: Caledonite
 Locality:
Grand Reef Mine, Laurel Canyon, Grand Reef Mountain, Klondyke, Aravaipa District, Graham County, Arizona, USA
 Dimensions: 3x3 mm
 Description:
grey-violet cryptocrystalline mineral that appears intergrown with the Caledonite
 Viewed:  1731 Time(s)

macro.jpg



macro2.JPG
 Mineral: Caledonite
 Locality:
Grand Reef Mine, Laurel Canyon, Grand Reef Mountain, Klondyke, Aravaipa District, Graham County, Arizona, USA
 Dimensions: 6 x 6 mm
 Description:
Chalk-white botryoidal unknown
 Viewed:  1732 Time(s)

macro2.JPG


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alfredo
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PostPosted: Mar 27, 2024 15:18    Post subject: Re: 2 Unknowns co-occurring with Caledonite, Grand Reef Mine, AZ  

You might want to ask Bill Besse in Tucson. He wrote his thesis on that mine.
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cfrench58




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PostPosted: Mar 27, 2024 16:15    Post subject: Re: 2 Unknowns co-occurring with Caledonite, Grand Reef Mine, AZ  

Thanks! Sent him msg via Mindat.
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Pete Richards
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PostPosted: Mar 27, 2024 19:47    Post subject: Re: 2 Unknowns co-occurring with Caledonite, Grand Reef Mine, AZ  

I wonder if the violet-grey mineral might not be cerussite or anglesite. The luster is suggestive.
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cfrench58




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PostPosted: Mar 28, 2024 09:37    Post subject: Re: 2 Unknowns co-occurring with Caledonite, Grand Reef Mine, AZ  

The geochemistry would certainly support that. I was also wondering about brochantite. Thanks for your thoughts!
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