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Large blue transparent crystal? Glass?
  
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Tony S




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PostPosted: Mar 22, 2017 14:18    Post subject: Large blue transparent crystal? Glass?  

Hello everybody,

My specialty is fossils, but I have a lot of inquiries from community members about "meteorites", rocks and minerals, and other "oddities". I have a gentlemen bringing in a specimen tomorrow. He sent these pictures to me prior to his visit. He said his elderly parents found it "out west" (USA), but I don't yet have more specific location data. I told him to go ahead and bring it in and I'd at least due a Moh's Hardness test on it (I've got one of those nice kits with the pencil-like metal stylus-type tools for hardness). The gentlemen thinks it might be blue topaz or aquamarine. I'm thinking it could be glass (I think I see conchoidal fracturing). What do you folks think based on the photos? What other tests can I do to help him identify his item?

Thanks a million,

Tony



Rock1.jpg
 Description:
Western USA
5 inches by 7 inches?
Unknown translucent blue crystal(?)
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Tony S




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PostPosted: Mar 22, 2017 14:19    Post subject: Re: Large blue transparent crystal? Glass?  

second photo


Rock2.jpg
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Western USA
Unknown
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Tony S




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PostPosted: Mar 22, 2017 14:19    Post subject: Re: Large blue transparent crystal? Glass?  

third photo


Rock3.jpg
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Western USA
unknown
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kushmeja




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PostPosted: Mar 22, 2017 14:32    Post subject: Re: Large blue transparent crystal? Glass?  

Definitely doesn't appear to be natural... either glass or some sort of slag
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Jordi Fabre
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PostPosted: Mar 22, 2017 14:46    Post subject: Re: Large blue transparent crystal? Glass?  

kushmeja wrote:
Definitely doesn't appear to be natural... either glass or some sort of slag

Absolutely
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Volkmar Stingl




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PostPosted: Mar 22, 2017 16:15    Post subject: Re: Large blue transparent crystal? Glass?  

Yes, glass, man-made
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Tony S




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PostPosted: Mar 23, 2017 12:59    Post subject: Re: Large blue transparent crystal? Glass?  

Thanks everybody. Much appreciated. The gentleman just brought in the specimen, and I have finished examining it. Apparently it came from rural Arkansas and was found and dug out of the ground when his parents were hiking. It had numerous obvious conchoidal fractures (like glass). Using the hardness picks, the lowest number that would scratch it was the 8 (so a Moh's reading of 7.5 - 8.5. I was skeptical of that because glass falls in the 5 - 6 range and even hardened glass usually doesn't get up to 8 (?). So I got out my representative minerals for hardness and tested them on the specimen. Quartz was the softest mineral that would scratch it (7). So it's hardness is actually 7 or less, right? (That would mean I am skeptical of the accuracy of my hardness picks...).

So I told the gentlemen that in my opinion (with your help considered) that it was tempered or hardened glass. I indicated if he wanted a second opinion to take it to a qualified mineralogist.

Thanks again for your help.

Tony
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