Rob H Posted May 10, 2013 Share Posted May 10, 2013 Someone sent me these photos of a rock that they are looking to identify. It is approximately .6" (15mm) in diameter, is not magnetic, is rather heavy for its size, and is close to lead in weight to size ratio. Please let me know if you recognize it. Quote Link to comment Share on other sites More sharing options...
James_S Posted May 10, 2013 Share Posted May 10, 2013 Looks like a marcasite nodule. Quote Link to comment Share on other sites More sharing options...
Rob H Posted May 12, 2013 Author Share Posted May 12, 2013 Looks like a marcasite nodule.Thanks for the reply, I'll pass this along to the owner of it. Quote Link to comment Share on other sites More sharing options...
Bob(AK) Posted May 18, 2013 Share Posted May 18, 2013 I joined this forum a couple years ago but never contributed, back now. Looks a lot like this pyrite ball (hope photo comes through) Bob Quote Link to comment Share on other sites More sharing options...
James_S Posted May 19, 2013 Share Posted May 19, 2013 Marcasite and pyrite are both FeS2. Marcasite and pyrite though have different crystal structures and marcasite has a lower density and and is more brittle. Quote Link to comment Share on other sites More sharing options...
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