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FMcC
I found this by a river in Perthshire, Scotland. I am no geologist but found the rusted ring too intriguing to pass up. Any help? 20200815_154128.jpg  20200815_154121.jpg  20200815_154110.jpg  20200815_154101.jpg  20200815_154054.jpg 
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Dirty Pete
That's a nice coffee table conversation piece. Looks like a banded/foliated metamorphic rock, schist/gneiss with a subsequently mineralised (iron rich) fracture.

Pete.
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prep01
I agree with Pete, but I'm not a geologist
Colin Huller
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FMcC
Thanks Pete, great insight. I had thought the stone carried too much grain (to my untrained eye it almost looks like wood). Eye catching none the less, certainly a keeper.

How would you suppose something like this formed?
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Dirty Pete
Through deep burial of the original rock (via regional tectonic processes) and being subjected to high temperatures/pressures/stresses. 

Pete.
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Narlgoth
Its an interesting shape and appearence, but it looks like a run of the mill Septarian to me. Formed when the stone itself was cracked or crushed in heat/pressure, then the crack was precipitated by by another mineral which formed the vein between (referred to as a septaria). I agree, its a great curiosity piece.
- Brad
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