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Amethyst Black Agate Sphere
  
  Index -> Incorrect classification and fakes
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thehippi




Joined: 25 Apr 2012
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PostPosted: Apr 25, 2012 19:28    Post subject: Amethyst Black Agate Sphere  

a new stone i just picked up


amethyst crystal ball 1-1.jpg
 Description:
Amethyst Black Agate
Brazil
2.7 In Diameter
 Viewed:  25013 Time(s)

amethyst crystal ball 1-1.jpg


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thehippi




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PostPosted: Apr 25, 2012 19:30    Post subject: Re: Amethyst Black Agate Sphere  

back side of the sphere


amethyst crystal ball 1-1-1.jpg
 Description:
Amethyst Black Agate
Brazil
2.7 In Diameter
 Viewed:  24956 Time(s)

amethyst crystal ball 1-1-1.jpg


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John S. White
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PostPosted: Apr 25, 2012 20:08    Post subject: Re: Amethyst Black Agate Sphere  

Sorry to be the bearer of bad news, but I fear that the agate has been dyed.
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thehippi




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PostPosted: Apr 25, 2012 20:43    Post subject: Re: Amethyst Black Agate Sphere  

What makes you believe that it is dyed?
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GneissWare




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PostPosted: Apr 25, 2012 21:05    Post subject: Re: Amethyst Black Agate Sphere  

thehippi wrote:
What makes you believe that it is dyed?


lot's of experience....its dyed.
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alfredo
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PostPosted: Apr 25, 2012 21:58    Post subject: Re: Amethyst Black Agate Sphere  

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




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PostPosted: Apr 28, 2012 12:56    Post subject: Re: Amethyst Black Agate Sphere  

This black agate is natural 100% ;).

Mihail



black agate.JPG
 Description:
Black agate, Mures Valley, Romania, 50x30x30
 Viewed:  24812 Time(s)

black agate.JPG



black agate 002.jpg
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Black agate, Mures Valley, Romania, FOV 14 mm
 Viewed:  24838 Time(s)

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cascaillou




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PostPosted: Jun 05, 2012 14:49    Post subject: Re: Amethyst Black Agate Sphere  

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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