Carbonado: Black Diamond
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  1. #1
    us
    Zach Powell

    Aug 2014
    Lexington, Kentucky
    27
    6 times

    Carbonado: Black Diamond

    I have been collecting rocks ever since I was a kid and I have started to find many different rare types of stones. I came across a large black metal-looking nugget while looking for cool stones in my grandparents gravel driveway and few years back. I have discarded the weird thing but my curiosity got the best of me this year. I took it out of its box and started inspecting a bit more. It is a black metal-looking stone and looks a bit like a mix of melted glass and melted metal on the side *You might be yelling at the screen "ITS OBSIDIAN!" It is not obsidian and I have tried to match it up with some specimens I already have. It has a greenish tint with a hint of red if shown under a light. It is luminescent green when under a black light so It could be a rare stone.

    Here is a picture with a silver quarter to size up...

    I will upload other better pictures. But so far all my tests have been leading to either two answers. Since it is not magnetic it is not iron or nickel and there is not other metal that can be black. So the answers to the what the stone is I think would be either Black Spinel or Carbonado (Black Diamond).

    Please post if you think I'm right on each on one of these or please tell me what could be other than these two answers!
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

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  2. #2
    us
    Mar 2012
    1,419
    1644 times
    All Types Of Treasure Hunting
    hematite?

  3. #3
    Charter Member
    us
    Jul 2012
    Blackfoot, Idaho
    White's GM2, GM3, DFX, Coinmaster, TDI-SL, GM24K, Falcon MD20, old Garrett Masterhunter BFO 'Way Too Cool' dual 18 Watt UV light
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    3811 times
    Prospecting
    Which UV did you use?....shortwave, or longwave?
    Jim

  4. #4
    us
    Zach Powell

    Aug 2014
    Lexington, Kentucky
    27
    6 times
    I used a long-wave black-light.

  5. #5
    us
    Zach Powell

    Aug 2014
    Lexington, Kentucky
    27
    6 times
    Quote Originally Posted by rodoconnor View Post
    hematite?
    I know it is not Hematite because i can't scratch it with any other harder stones.

  6. #6
    Charter Member
    us
    Jul 2012
    Blackfoot, Idaho
    White's GM2, GM3, DFX, Coinmaster, TDI-SL, GM24K, Falcon MD20, old Garrett Masterhunter BFO 'Way Too Cool' dual 18 Watt UV light
    2,902
    3811 times
    Prospecting
    Sometimes, you can get an idea about a substance by the way it reacts, or doesn't react, to UV light. But to do that you need to expose it to both types and see what happens. A good example is ruby.....it fluoresces bright red under SW, and has no reaction to LW. Some materials fluoresce different colors depending on the wave length of the UV.
    Jim

  7. #7
    cn
    Jul 2014
    Wuhan, Hubei Province
    76
    43 times
    All Types Of Treasure Hunting
    Looks like garnet to me?

  8. #8
    us
    Mar 2014
    Traveling US to work
    Current Equinox 600 Past Whites DFX Garret GTI 2500 and others Prospecting Minelab GPZ 7000 Past SD 2100 GP 3000 (retired)
    2,318
    1981 times
    All Types Of Treasure Hunting
    If its fluorescing green its a silicate. From the description I'd say you may have a nodule of rainbow obsidian. The coloration and description fit.
    Everyone Believes they have gold buried in the back yard... small wonder so few ever look for it.

  9. #9
    us
    Gold & Gem Prospector

    Nov 2012
    Western North Carolina
    Fisher GBII
    292
    267 times
    Prospecting
    Put a diamond tester on it and settle the question of whether a diamond or not. It does look like hematite.

  10. #10
    us
    Zach Powell

    Aug 2014
    Lexington, Kentucky
    27
    6 times
    Quote Originally Posted by Buckshotnc View Post
    Put a diamond tester on it and settle the question of whether a diamond or not. It does look like hematite.
    Problem is, I don't have the money to buy a diamond tester. That's why I came to this site.

  11. #11
    us
    Zach Powell

    Aug 2014
    Lexington, Kentucky
    27
    6 times
    Quote Originally Posted by PamDF View Post
    Looks like garnet to me?
    I know it is not garner because of it not being magnetic. Garnets usually have a slight magnetic pull.

  12. #12
    us
    Zach Powell

    Aug 2014
    Lexington, Kentucky
    27
    6 times
    Quote Originally Posted by DDancer View Post
    If its fluorescing green its a silicate. From the description I'd say you may have a nodule of rainbow obsidian. The coloration and description fit.
    I actually have a sample of rainbow obsidian and know how it. Though silicates usually are able to scratched easily. But thanks for the suggestion.

  13. #13
    us
    Zach Powell

    Aug 2014
    Lexington, Kentucky
    27
    6 times
    Just to settle confusion. Hematite is way more fragile that this rock. Hematite contains ferrous metals and is easily picked up by magnets. Hematite also has a crystal structure, which this does not.

  14. #14
    us
    Brian T. Booth

    Feb 2013
    Glasgow KY
    Minelab: Eureka Gold
    299
    103 times
    All Types Of Treasure Hunting
    Quote Originally Posted by zak_0 View Post
    Just to settle confusion. Hematite is way more fragile that this rock. Hematite contains ferrous metals and is easily picked up by magnets. Hematite also has a crystal structure, which this does not.
    Hematite doesn't always show crystal structure. Especially if it were in a weathering environment. Naturally occurring hematite isn't magnetic. Not to wear normal magnets can have an effect. If you have a pice of hematite that's magnetic it's a synthetic.
    Clay Diggins likes this.

  15. #15
    us
    Jun 2011
    23
    2 times
    Take it to a local jewelry store, they will probably have a diamond tester available --- and if you ask nice can test quickly. Most high end Pawn shops will have one also.

 

 
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