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Can anyone help me identify this rock?
  
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Luna_moon




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PostPosted: Jan 27, 2017 23:49    Post subject: Can anyone help me identify this rock?  

So, I've had some people say blue lace agate, and indigo gabbro. What are your thoughts?


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Luna_moon




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PostPosted: Jan 27, 2017 23:49    Post subject: Re: Can anyone help me identify this rock?  

Another view


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marco campos-venuti




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PostPosted: Jan 28, 2017 00:58    Post subject: Re: Can anyone help me identify this rock?  

Boulder opal from Australia.
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Volkmar Stingl




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PostPosted: Jan 28, 2017 01:09    Post subject: Re: Can anyone help me identify this rock?  

No, not a boulder opal! This is an agate in fine grained volcanic groundmass.
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John S. White
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PostPosted: Jan 28, 2017 06:55    Post subject: Re: Can anyone help me identify this rock?  

Looks more like a boulder opal to me.
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Tobi




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PostPosted: Jan 28, 2017 07:20    Post subject: Re: Can anyone help me identify this rock?  

I agree with Marco and John, rather Australian opal in matrix than agate. Some closer shots would be good, if we can see some opalescence we'd know for sure what this rock is ;-)
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John S. White
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PostPosted: Jan 28, 2017 11:38    Post subject: AlleyRe: Can anyone help me identify this rock?  

Opal yes, but Virgin Valley not Australia.
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Luna_moon




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PostPosted: Jan 28, 2017 13:48    Post subject: Re: Can anyone help me identify this rock?  

Yeah, there's this purple streak that is brighter than the rest that refracts in the light like opal would but it's the only area in the rock that does this.


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John S. White
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PostPosted: Jan 28, 2017 18:48    Post subject: Re: Can anyone help me identify this rock?  

From that picture it looks more like slag glass.
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Dale Hallmark




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PostPosted: Jan 28, 2017 20:56    Post subject: Re: Can anyone help me identify this rock?  

Yeah, but once something is polished it looks like a million other things and loses all interest for me. Without some testing I would just call it a chalcedony knowing that is a loose defining term but most would be satisfied with.
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John S. White wrote:
From that picture it looks more like slag glass.
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