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I'm not even sure it is rock or if it's something man made. Non magnetic, weight 25g. Found on a beach in Charmouth, England. enter image description here

enter image description here

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  • $\begingroup$ South coast of where in the world? $\endgroup$ – gerrit Jan 16 '18 at 15:28
  • $\begingroup$ Good point! England, sorry I should have realised I was on the web! $\endgroup$ – Richard Evans Jan 16 '18 at 15:49
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    $\begingroup$ Where exactly on the south coast? Parts of the south coast are known for their fossils and this could be some sort of fossil. $\endgroup$ – bon Jan 16 '18 at 19:30
  • $\begingroup$ If I remember correctly it was Charmouth. $\endgroup$ – Richard Evans Jan 16 '18 at 23:00
  • $\begingroup$ it might be a stromatolite en.wikipedia.org/wiki/Stromatolite but i have no idea if it have been found in charmouth. $\endgroup$ – trond hansen Jan 18 '18 at 8:02
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Could it be an overly pyritized ammonite? The links below indicate the area is known for it.

"bubbly" appearance is due the growth of the pyrite by bacteria when the ammonite was buried in the seabed about 1 metre, 195 million years ago.

Link here

Another link

Yet another link

This is one of the examples from above. I would recommend also posting in those forums.

overly pyritized ammonite

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