bunnyfights
noticing nice landscape pebbles
Member since May 2022
Posts: 83
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Post by bunnyfights on Sept 16, 2022 8:43:03 GMT -5
No Pics yet just looking for input on some rocks I have been passing up.
Does anyone know if black Jasper is a thing or maybe other very dark variants? I have found a few rocks that look like they could be black jasper but since I have a limited rock caring capacity, I have not been collecting them. If they are back jasper, is there a use or market for rocks of this type?
Thanks all,
Ken...
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Post by fernwood on Sept 16, 2022 9:45:44 GMT -5
I find some black chert at my place. Sometimes it contains areas of what looks like orange jasper.
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Post by mohs on Sept 16, 2022 9:50:05 GMT -5
have a black block of real fine grain rock consider it a chert or flint regardless it fave jasp type rock maybe I can get pic...
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Post by opalpyrexia on Sept 16, 2022 10:50:46 GMT -5
If they are back jasper, is there a use or market for rocks of this type?
If it's truly black, say a "midnight black", cutters who make doublets would be interested.
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Sabre52
Cave Dweller
Me and my gal, Rosie
Member since August 2005
Posts: 20,456
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Post by Sabre52 on Sept 16, 2022 17:10:20 GMT -5
Yep, there is black jasper but deep true black is actually pretty scarce. I used to have a big block I found at Lavic Siding, of all places. But most are really deep gray if you polish them.
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jamesp
Cave Dweller
Member since October 2012
Posts: 36,154
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Post by jamesp on Sept 16, 2022 17:21:10 GMT -5
To make 'black' glass they often use a color agent that makes it a very dark purple or another that makes it dark brown. A thin chip backlit with strong light may reveal if it is true black or not.
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Post by vegasjames on Sept 16, 2022 18:36:08 GMT -5
Yes, there is a black jasper. There is also a black chalcedony, which is the translucent version of chalcedony. Naturally black chalcedony is very rare and therefore often faked by microfracturing sard (brown chalcedony). Then they soak the stone in a sugar solution from months to years, then put the stone in sulfuric acid to carbonize the sugar to make the stone appear black. This is natural black chalcedony I find here in Southern Nevada and natural onyx, which is the banded black and white chalcedony.
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Post by mohs on Sept 16, 2022 18:54:12 GMT -5
A couple pics of my block of black rock & a little nugget. My block of rock is not as black as I thought More grayish Although that little nugget is black They both can be scratched w/ an agate So I now think both are obsidian's Doesn’t really contribute a lot Butte I tried Wondering if anyone ever heard of black jade ? Thx Ed
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Post by vegasjames on Sept 16, 2022 19:21:35 GMT -5
Wondering if anyone ever heard of black jade ? Thx Ed Yes, there is black jade in Southern California near Victorville.
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Post by parfive on Sept 18, 2022 22:26:58 GMT -5
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realrockhound
Cave Dweller
Member since June 2020
Posts: 2,845
Member is Online
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Post by realrockhound on Sept 18, 2022 23:29:11 GMT -5
No Pics yet just looking for input on some rocks I have been passing up. Does anyone know if black Jasper is a thing or maybe other very dark variants? I have found a few rocks that look like they could be black jasper but since I have a limited rock caring capacity, I have not been collecting them. If they are back jasper, is there a use or market for rocks of this type? Thanks all, Ken... Yep, there is black jasper. If it’s solid black, then it can be used as backing material for doublets.
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bunnyfights
noticing nice landscape pebbles
Member since May 2022
Posts: 83
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Post by bunnyfights on Sept 19, 2022 9:09:18 GMT -5
Thanks for all info! Went out this weekend and kept a black rock I would have normally passed on. Pics were difficult do to the reflections, which you will see in the two following samples: Thoughts?
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