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What is this rock?

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GeoRock

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What is this rock?
Submitted by GeoRock on Mon, 08/27/2012 - 13:41.

I found this rock on the banks of the River Severn in Llanidloes, Wales.

I was hoping someone here would be able to identify what it is. My best guess is that it could be Antimony, Manganese or possibly Wurtzite. But to be honest, I don't really have a clue...

 Anyone care to take a stab at identifying it?

  

Boogie

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My guess is pyrite.
Mon, 08/27/2012 - 22:43

My guess is pyrite.

Gus Horsley

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Agreed, I think it's pyrite
Wed, 08/29/2012 - 09:28

Agreed, I think it's pyrite too.  The area it came from is notable for a wide variety of crystal forms, from the usual cubes to cogwheels.  

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