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help identifying this quartz (?) with mysterious luminescence
  
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jrh4




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PostPosted: Jun 27, 2018 17:48    Post subject: help identifying this quartz (?) with mysterious luminescence  

This is a really cool specimen I collected years ago in AZ or UT (I can't remember) and I always thought it was just a quartz crystal with mica, but recently upon closer inspection I noticed that the rock had some opalescence or something (shiller effect). It shines a bright blue in the right light, and only on certain areas of the white/clear rock. It's really cool to look at, but I have no idea what it is or why it has that brilliant effect. Can anyone help me to identify this guy? Thanks!


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Rockhound.newmexico




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PostPosted: Jun 27, 2018 18:09    Post subject: Re: help identifying this quartz (?) with mysterious luminescence  

I'm far from an expert so if I'm wrong I apologize in advance, but it looks like moonstone to me. But that's just a WAG
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jrh4




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PostPosted: Jun 27, 2018 18:56    Post subject: Re: help identifying this quartz (?) with mysterious luminescence  

haha, thanks for the feedback. I thought of that, just not sure.

Does anyone else have an educated guess?
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Pete Richards
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PostPosted: Jun 27, 2018 19:57    Post subject: Re: help identifying this quartz (?) with mysterious luminescence  

Moonstone is typically a variety of feldspar, named for its play of color at certain angles. Being a non-scientiic name, there is disagreement about which feldspar(s) can be moonstone. There's a good basic discussion on Wikipedia. Mindat has a different opinion.

I don't think you will see this play of color in quartz.

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lluis




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PostPosted: Jun 28, 2018 05:49    Post subject: Re: help identifying this quartz (?) with mysterious luminescence  

Hi, Pete, Jrh4, list,

As Pete said, I do not think your specimen is quartz. It seems to have cleavage planes, which quartz does not have. But yes, a feldspar. And as Pete says, some feldspars have schiller effect...

Personally I think it is a feldspar with moonstone effect.
For which is, well, I saw that Gunnar Färber has placed those from Tanzania as albite.
This one, no idea of what can be....
It looks very close to those Tanzania albites, though....

With best wishes

Lluís
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Riccardo Modanesi




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PostPosted: Jun 28, 2018 10:39    Post subject: Re: help identifying this quartz (?) with mysterious luminescence  

Hi to everybody!
I agree with the biggest majority of you: it's a feldspar, I think orthoclase or albite, better known with the popular name "adularia" or "moonstone". Moonstone is a variety of orthoclase and/or albite which is much suitable to be cut as a cabochon, so that the curve emphasizes the moonstone light effect, i.e. the bluish light reflection.
Greetings from Italy by Riccardo.

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Hi! I'm a collector of minerals since 1973 and a gemmologist. On Summer I always visit mines and quarries all over Europe looking for minerals! Ok, there is time to tell you much much more! Greetings from Italy by Riccardo.
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jrh4




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PostPosted: Jun 28, 2018 15:41    Post subject: Re: help identifying this quartz (?) with mysterious luminescence  

You guys are awesome! The only reason I initially thought it was quartz was because it has big flakes of mica attached to it and I feel like I often see those 2 together. But I see now that is probably is some form of feldspar with that "moonstone" effect. Thanks for all the input!
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