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Help identifying this rock
  
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James Anderson




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PostPosted: Oct 26, 2018 19:57    Post subject: Help identifying this rock  

This rock was given to me by my niece from her stay in Virginia, USA. I usually am pretty savvy when it comes to identifying rocks, gemstones, minerals etc, but this one has me stumped. I have not been able to find anything that even remotely resembles this rock. As you can see in the pictures the rock has a very definite blue color to it with a swirled lighter blue color almost creating a marble of darker and lighter blue colors. Interesting also is the fact of the Stone has some spots that appear to have some sort of burnt or charred organic matter. The story gets even better though, to my complete and total accidental discovery this rock has magnetic properties as as I found magnets do cling to it. Any help identifying this rock would be much appreciated!!


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James Anderson




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PostPosted: Oct 26, 2018 20:01    Post subject: Re: Help identifying this rock  

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James Anderson




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PostPosted: Oct 26, 2018 20:02    Post subject: Re: Help identifying this rock  

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James Anderson




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PostPosted: Oct 26, 2018 20:03    Post subject: Re: Help identifying this rock  

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James Anderson




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PostPosted: Oct 26, 2018 20:05    Post subject: Re: Help identifying this rock  

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James Anderson




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PostPosted: Oct 26, 2018 20:06    Post subject: Re: Help identifying this rock  

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Bob Harman




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PostPosted: Oct 26, 2018 20:54    Post subject: Re: Help identifying this rock  

If from Virginia, probably excess blue ceramic glass from a glass works poured out and onto nearby rock forming a type of glass slag. I do not think that it is a polished natural microcrystalline blue chalcedony type quartz. Whatever it is, nice find. Perhaps the rock is weakly magnetic, but of that, I am skeptical.
BOB
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James Anderson




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PostPosted: Oct 26, 2018 21:27    Post subject: Re: Help identifying this rock  

Definitely is magnetic. Magnets definitely sticks to this rock.
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franjungle
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PostPosted: Oct 26, 2018 22:10    Post subject: Re: Help identifying this rock  

Hi James.

Welcome to FMF.

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Volkmar Stingl




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PostPosted: Oct 27, 2018 02:45    Post subject: Re: Help identifying this rock  

Definitely glass slag.
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Bob Harman




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PostPosted: Oct 27, 2018 04:31    Post subject: Re: Help identifying this rock  

VOLKMAR, Thanks for agreeing with me on this.

JAMES A, "Definitely magnetic.....a magnet sticks to the rock". Well JAMES, I believe that you have this wrong.

If your rock contains some iron, yes the magnet will stick to it, but it is the magnet that is magnetic and not the rock.

On the other hand if your rock was composed of the mineral magnetite it would attract such non-magnetic objects such as a small iron nail or small iron paperclip. Then your rock would be magnetic. So put a small iron nail or paperclip on a smooth table top and see if these objects can be moved by the rock or jump up and attach to the underside of the rock. If done carefully, and that occurs, only then would your rock be magnetic.

Iron objects like iron containing rocks, nails, paperclips, etc are not, by themselves, magnetic. They need to be brought into a magnetic field to show the property of magnetism. The magnet and the mineral magnetite have this property of a magnetic field to help show the property of magnetism.
James, it might help if you reviewed these basic principles of magnetism.

BOB
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R Saunders




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PostPosted: Oct 27, 2018 05:53    Post subject: Re: Help identifying this rock  

Did she find it or buy it? Look up Michigan Leland Blue Stone. a slag that was dumped and people are turning it into jewelry. Circa 1900. Just a possible.
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