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539 Views 2 Replies Last post: Jul 23, 2013 11:35 AM by MikeHardman RSS
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Jul 14, 2013 8:42 PM

I've found an almost perfectly round piece of rock!

I found this today in a river in a wood in cornwall. Are such round pieces of rock rare? I have never seen such a round piece of rock. Have you?image (1).jpegimage (2).jpeg

  • Hi

    Yes I collect them.

    I have no idea what they are, but we live on boulder clay and you sometimes find them.  Some are brown and some smooth.

    Can't help.

    I posted a stone I broke in half and it looks like an egg.  I sent it in as "Fossil Egg?" but haven't had a reply yet.

    Ju

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  • They appear to pieces of a pale granite.

    There is a rock type called orbicular granite, which you might think was a lead in the right direction, but not so.

     

    I think these pieces of rock, which merely by accident might be granitic, have become well-rounded because of natural actions in potholes in the beds of the stream. When I state 'potholes', don't think of caving; think of much smaller depressions in the rock forming the bed of a stream or river. These start to form by chance, then cobbles get trapped in them, being nudged endlessly by the current, wearing the pot hole deeper and themselves rounder.

    http://www.angelfire.com/hero/gerald_koh_s9029362a/potholes.htm

     

    Mike

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