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thehippi
Joined: 25 Apr 2012
Posts: 8
Location: Utah
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 Posted: Apr 25, 2012 19:28 Post subject: Amethyst Black Agate Sphere |
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a new stone i just picked up
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Amethyst Black Agate
Brazil
2.7 In Diameter
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25125 Time(s) |
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thehippi
Joined: 25 Apr 2012
Posts: 8
Location: Utah
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| Posted: Apr 25, 2012 19:30 Post subject: Re: Amethyst Black Agate Sphere |
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back side of the sphere
| Description: |
Amethyst Black Agate
Brazil
2.7 In Diameter
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25065 Time(s) |
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John S. White
Site Admin
Joined: 04 Sep 2006
Posts: 1295
Location: Stewartstown, Pennsylvania, USA
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| Posted: Apr 25, 2012 20:08 Post subject: Re: Amethyst Black Agate Sphere |
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Sorry to be the bearer of bad news, but I fear that the agate has been dyed.
_________________
John S. White
aka Rondinaire |
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thehippi
Joined: 25 Apr 2012
Posts: 8
Location: Utah
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| Posted: Apr 25, 2012 20:43 Post subject: Re: Amethyst Black Agate Sphere |
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| What makes you believe that it is dyed?
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GneissWare
Joined: 07 Mar 2008
Posts: 1287
Location: California
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| Posted: Apr 25, 2012 21:05 Post subject: Re: Amethyst Black Agate Sphere |
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| thehippi wrote: | | What makes you believe that it is dyed? |
lot's of experience....its dyed.
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alfredo
Site Admin
Joined: 30 Jan 2008
Posts: 979
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| Posted: Apr 25, 2012 21:58 Post subject: Re: Amethyst Black Agate Sphere |
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I agree... Dyed. If you visit amethyst-bearing basalts, you will see only colourless, pale grey or pale bluish agate around the basalt vugs, no black.
In the past, the usual way to make agate black was to soak it for months in sugar water and then in sulphuric acid, which carbonized the sugar. I'm not sure whether that is still done or whether there is a more modern process with synthetic dyes?
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mihailovici79
Joined: 07 Sep 2011
Posts: 111
Location: Timisoara
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| Posted: Apr 28, 2012 12:56 Post subject: Re: Amethyst Black Agate Sphere |
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This black agate is natural 100% ;).
Mihail
| Description: |
| Black agate, Mures Valley, Romania, 50x30x30 |
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24922 Time(s) |
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| Black agate, Mures Valley, Romania, FOV 14 mm |
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24947 Time(s) |
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cascaillou
Joined: 27 Nov 2011
Posts: 250
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| Posted: Jun 05, 2012 14:49 Post subject: Re: Amethyst Black Agate Sphere |
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| Black chalcedony (aka onyx) is brown to very dark brown. But truly black onyx is very rare, if any. It is quite common that onyx is dyed to make it really black.
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