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Cobalt and green rock help identifying
  
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Tracy cameron




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PostPosted: Oct 03, 2017 09:56    Post subject: Cobalt and green rock help identifying  

Hi. I'm new to the forum. Please excuse my lack of knowledge. I'm a CPA I do estate evaluations. Come across minerals occasionally which I'm very interested in but don't have time yet to learn more. Came across this piece, I don't even know if it is a mineral? It is beautiful cobalt blue and emerald green. Has a very glassy surface and it quite heavy weighting 511 grams. Any ideas?


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Peter Lemkin




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PostPosted: Oct 03, 2017 10:06    Post subject: Re: Cobalt and green rock help identifying  

Sorry to inform you it is most probably glass and definitely human made - not a mineral.
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John Betts




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PostPosted: Oct 03, 2017 10:14    Post subject: Re: Cobalt and green rock help identifying  

It appears to be slag.
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Tracy cameron




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PostPosted: Oct 03, 2017 10:20    Post subject: Re: Cobalt and green rock help identifying  

Had a inclination that was the case. Thank you for your time appreciate it.
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Pete Modreski
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PostPosted: Oct 03, 2017 12:51    Post subject: Re: Cobalt and green rock help identifying  

And with such nice shades of color, it's likely to be some kind of leftover glass from a glassworks making decorative/ornamental glass, as opposed to true "slag" that are the leftovers from a mining & smelting operation--those are usually darker colored, sometimes black and opaque and very heavy, or dull and cloudy, brownish, brownish green, etc.
I'm never sure if these "pretty chunks" like this are true leftovers, or are made that way on purpose to sell as decorative rocks.
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Tracy cameron




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PostPosted: Oct 03, 2017 23:20    Post subject: Re: Cobalt and green rock help identifying  

Thanks for your input. It makes perfect sense it came from an area where there was glass making industry. Thanks
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