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 Post subject: Seeking cutter for large cuprite
PostPosted: Fri Mar 08, 2019 9:13 pm 
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I've got a chunk of cuptrite from Onjanga, Namibia I got a few years back. Somethining like 15 g corner of a larger crystal.
When I was more active in gemology (hobby, not pro) I saw some of Jay Medici's stones and loved them- he does amazing work on difficult stones. I saw him at a local rock show in Michigan and inquired about cutting, but back then his 6 month lead time seemed a bit much. I do believe he is well-known.

Time has passed, and I'd like to get this rough cut into the glorious gem I know is inside. But I lost his card and now can't seem to find any way to contact Jay, and I don't know any other cutters I would entrust it to.

So I turn here- I know both hobby and pro cutters drop in occasionally. So I appeal to you all and your acquaintances:
Who cuts such material (well), and would they be interested in taking such a commission?

Reply in response, or let me know by PM (they have that here, don't they?)

I don't drop by very often any more so I may not see a reply immediately.

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 Post subject: Re: Seeking cutter for large cuprite
PostPosted: Thu Aug 15, 2019 2:15 pm 
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hate to do this but...
bump :)

Thanks!

I'd even be grateful for hints/suggestions on techniques and such. I might just get into cutting myself some day.

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 Post subject: Re: Seeking cutter for large cuprite
PostPosted: Thu Aug 15, 2019 3:42 pm 
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I suggest that you post a picture of the rough stone.

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 Post subject: Re: Seeking cutter for large cuprite
PostPosted: Tue Aug 20, 2019 2:43 pm 
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I've got some shots but am having difficulty signing up for imgur. When I have things worked out... you can see it- 110 ct of coppery goodness.
Attachment:
oblique crystal.jpg
oblique crystal.jpg [ 194.31 KiB | Viewed 781 times ]
Attachment:
oblique crystal.jpg
oblique crystal.jpg [ 194.31 KiB | Viewed 781 times ]
I


Attachments:
side illum xtal up.jpg
side illum xtal up.jpg [ 195.99 KiB | Viewed 781 times ]
side thickness.jpg
side thickness.jpg [ 90.3 KiB | Viewed 781 times ]
crystal edge1.jpg
crystal edge1.jpg [ 271.74 KiB | Viewed 781 times ]
back low light.jpg
back low light.jpg [ 97.49 KiB | Viewed 781 times ]

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 Post subject: Re: Seeking cutter for large cuprite
PostPosted: Tue Aug 20, 2019 4:57 pm 
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I'm seeing what appears to be conchoidal fracturing.
Cuprite has 3 directions of well defined cleavage,


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 Post subject: Re: Seeking cutter for large cuprite
PostPosted: Wed Aug 21, 2019 2:13 am 
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Norman's photographs are of a very typical piece of Onganja cuprite. I have cut several large cuprites from Onganja (see photo below - the square stone is 32.34 ct), but did not respond to Norman's request because I presume he is looking for a local cutter in the USA, and I am in South Africa. Getting the rough to me and the cut stone back to him would be problematic.
Attachment:
Cuprite1.JPG
Cuprite1.JPG [ 611.52 KiB | Viewed 750 times ]


Last edited by Duncan Miller on Wed Aug 21, 2019 12:14 pm, edited 1 time in total.

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 Post subject: Re: Seeking cutter for large cuprite
PostPosted: Wed Aug 21, 2019 10:49 am 
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You might check with Coast to Coast Rarestones - some of the members of that company have been known for cutting large, soft, and difficult gems in the past. Perhaps they could make a recommendation.

https://www.rarestone.com/our_people.php

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 Post subject: Re: Seeking cutter for large cuprite
PostPosted: Wed Aug 21, 2019 6:18 pm 
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Thanks Duncan. I've never seen anything like this before
I did a wee search and it seems that a lot of this material is coated in malachite.
Thank you too, Norman.
Please post when you get the material cut.


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 Post subject: Re: Seeking cutter for large cuprite
PostPosted: Thu Aug 22, 2019 2:38 am 
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Barbra Voltaire wrote:
I did a wee search and it seems that a lot of this material is coated in malachite.

That is true, but often the coating is removed with acid to check the clarity of potential faceting rough. Onganja collector mineral specimens usually are left with their malachite coating, but not always (see https://www.mindat.org/gallery.php?loc=2423&min=1172).


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 Post subject: Re: Seeking cutter for large cuprite
PostPosted: Thu Aug 22, 2019 12:15 pm 
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Wow!


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 Post subject: Re: Seeking cutter for large cuprite
PostPosted: Thu Aug 22, 2019 4:40 pm 
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First, a big thanks to Ms Voltaire for posting the pictures for me. It may or may not have been obvious, but the ruler is in inches. Big.

Second... Wow, Duncan... those are awesome. And I am in the US... I've gotten rough from South Africa some years ago... but yeah, I'd worry about safety in transit. Each way. :)

Third- thanks to everybody for their comments and suggestions.

And I WILL post pics if it gets cut

Promise.

;)

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 Post subject: Re: Seeking cutter for large cuprite
PostPosted: Fri Aug 23, 2019 7:49 am 
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When I saw these I took a look around the UK mines info
and there are a few mentions but nobody seems excited
about it -

While the material may be soft it does look nice when cut.
perhaps it's been overlooked in the UK a little.


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 Post subject: Re: Seeking cutter for large cuprite
PostPosted: Fri Aug 23, 2019 9:06 am 
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The rarity and low hardness keep it out of the mainstream, but it has incredible optical properties and is highly sought after as a collector's stone. That is just a more limited market with a bit less fanfare.

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 Post subject: Re: Seeking cutter for large cuprite
PostPosted: Fri Aug 23, 2019 6:58 pm 
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I bought a faceted cuprite in Idar-Oberstein in the 80s.
Doesn't hold a candle to Duncan's.


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 Post subject: Re: Seeking cutter for large cuprite
PostPosted: Sat Aug 31, 2019 3:06 pm 
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Barbra Voltaire wrote:
I bought a faceted cuprite in Idar-Oberstein in the 80s.
Doesn't hold a candle to Duncan's.


Neither of my ~1 ct, precision cut little "crumbs" (compared to this big ol' loaf of copper (I) oxide) do either.

I've seen big 'uns, and they are really special. Even wikipedia thinks so ;)
https://en.wikipedia.org/wiki/Cuprite

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