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I think I fit your requirements - I majored in Geology at UNSW and did some Palaeontology at Macquarie Uni - so I'll throw in my 2 cents worth...
Split the bugger with a hammer so we can see a fresh(er) surface...
Cheers,
Mario
PS Limestone will dissolve in vinegar over time.
Last edited by cybereye; 21-08-2014 at 12:54 PM.
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