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Probable ruby/garnet mix?
  
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quigi




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PostPosted: Aug 26, 2021 11:35    Post subject: Probable ruby/garnet mix?  

These crystals were found in the same area as the one I posted under the topic I posted here https://www.mineral-forum.com/message-board/viewtopic.php?t=6502 on the northern shores of Lake Erie.

I've removed the matrix and now that I have a dual SW/LW UV I decided to check them out.

From what I understand, garnet and ruby don't form in the same matrix and garnet doesn't fluoresce like a ruby, so I'm a bit confused with these results.

Any thoughts?

Thanks!



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John Betts




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PostPosted: Aug 26, 2021 13:30    Post subject: Re: Probable ruby/garnet mix?  

Zircon and corundum (ruby) do occur together. Zircon frequently fluoresces yellow though.

It would be helpful if you could perform scratch test. Corundum is hard and will scratch topaz and beryl.

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Joseph McAnney




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PostPosted: Aug 26, 2021 14:03    Post subject: Re: Probable ruby/garnet mix?  

It looks like the matrix is fluorescing red. Feldspar can fluoresce red and garnet occurs in feldspar.
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quigi




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PostPosted: Aug 26, 2021 15:04    Post subject: Re: Probable ruby/garnet mix?  

John Betts wrote:
Zircon and corundum (ruby) do occur together. Zircon frequently fluoresces yellow though.

It would be helpful if you could perform scratch test. Corundum is hard and will scratch topaz and beryl.


I think it's smokey qtz in a feldspar matrix...I'm pretty sure I put it in the wrong sample bag now lol. Thanks for your help and later on today I'll be posting another that I'm really on the fence about.
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quigi




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PostPosted: Aug 26, 2021 15:06    Post subject: Re: Probable ruby/garnet mix?  

Joseph McAnney wrote:
It looks like the matrix is fluorescing red. Feldspar can fluoresce red and garnet occurs in feldspar.


You're right about the feldspar...I put the smokey qtz in the wrong sample bag lol. Thanks for your help and I've got another post coming up later after I clean up the sample...(hoping I can retire from it lol)
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Bob Carnein




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PostPosted: Aug 26, 2021 15:07    Post subject: Re: Probable ruby/garnet mix?  

I agree with Joseph. Apparently, the garnet (?) is partly surrounded by light colored material that is fluorescing, and that could be microcline.
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Josele




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PostPosted: Aug 27, 2021 05:53    Post subject: Re: Probable ruby/garnet mix?  

Fluorescence color alone is not a definitive way to recognize mineral species. White stuff fluorescing red could be also calcite.
In other hand, feldspar with red fluorescence use to be plagioclase more than microcline.
I think in this case hardness is a more reliable way to distinguish between garnet and corundum. Try to scratch a piece of beryl or topaz, which will be scratched by corundum but not by garnet.
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Bob Carnein




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PostPosted: Aug 27, 2021 09:56    Post subject: Re: Probable ruby/garnet mix?  

That's true, of course, and it illustrates why this kind of discussion isn't very useful without more information.
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