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March 24, 2019, 01:07:01 pm
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Black Jade

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Author Topic: Black Jade  (Read 142 times)
zurn
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« on: February 18, 2019, 02:47:44 pm »

Hello All
been a while since I've posted
I'm in the market for black jade that will take a
high polish
Any suggestions are appreciated
Tony
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redrockrods
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« Reply #1 on: February 19, 2019, 10:15:45 am »

The Arizona stuff polishes nicely and sometimes has metallic crystalline inclusions. Technically it's not a jade though so if it absolutely has to be nephrite then you'll want to look for the Wyoming material. It's getting hard to find though.
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zurn
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« Reply #2 on: February 19, 2019, 11:03:22 am »

Hi thanks for responding Red
Ya I have some from Arizona no its definitely not nephrite jade
and its those inclusions that i'm trying to avoid
I had some nice material that polished like black onyx
I posted a couple of intarsia pieces using this material a while back I think they are still up
check em out
I have about 50 precious grams left
Trying to re-up
like the Picasso marble in you ID pic
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southerly
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« Reply #3 on: February 19, 2019, 12:23:43 pm »

Wyoming black jade and Cowell black jade from South Australia are the main sources of black nephrite jade.

Stay away from the West Australian black jade 'absolute black' it is not classed as true nephrite. It is great aterial for backing etc though.
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slabbercabber
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« Reply #4 on: February 20, 2019, 06:08:26 am »

Are you looking for Edwards black jade or the extremely dark Wyoming jade that looks black.  I have the latter.
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zurn
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« Reply #5 on: February 20, 2019, 04:09:48 pm »

Thats the problem I'm not up on the source so not sure

The Wyoming does it have those crystalline inclusions like the Arizona?

 I am not familiar with Edwards black jade

Im not helping you help me am I
What I know is I'm looking for material that polishes like black onyx
I like it for framing intarsia and other stuff
I always heard that the best black comes from Australia
I have small amount that is black no green on edges when held to light
no and polishes beautifully
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slabbercabber
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« Reply #6 on: February 20, 2019, 06:16:52 pm »

I believe the Edwards comes from Australia but the cost would be rather disturbing if you want to cut pieces large enough to frame intarsia.  The Wyoming jade does occasionally include quartz crystals.  I'll take some photos tomorrow in sunlight so you can see what it looks like.
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slabbercabber
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« Reply #7 on: February 21, 2019, 02:14:38 pm »

Well, forget the sunllight.  It is raining in East Texas and expected to continue for several days.  I took this photo in LED lighting.  This rock is about 30 pounds.


* DSC09324.JPG (634.48 KB, 1552x1600 - viewed 3 times.)
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zurn
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« Reply #8 on: February 26, 2019, 11:33:48 am »

Nice
as I said main thing is how it polishes
I'm looking for material that resembles black onyx
when polished
Do you know if this slab will produce that
It looks like some material I have
nice slab though
thanks for showing
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slabbercabber
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« Reply #9 on: February 26, 2019, 01:42:40 pm »

I polished a corner of a small slab.  This is 50,000 grit diamond.  Buffing with tin oxide dulls it somewhat.  I didn't try anything else.


* DSC09341.JPG (652.05 KB, 1600x1294 - viewed 1 times.)
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Taogem
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« Reply #10 on: February 27, 2019, 11:09:27 pm »

I polished a corner of a small slab.  This is 50,000 grit diamond.  Buffing with tin oxide dulls it somewhat.  I didn't try anything else.

Since tin oxide is much courser than 50,000, makes sense it would dull it some..

Not sure what this jasde would turn out like if you started with about 80 and worked your way up through all the normal grits before polishing. Maybe using some diamond paste ?  I am not much of a jade guy...  dunno
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slabbercabber
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« Reply #11 on: February 28, 2019, 06:05:21 am »

50,000 was the final belt.  I did go through the full range.  Eight grits altogether.
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