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<p>[QUOTE=&quot;Any Jewelry, post: 13051177, member: 2844&quot;]Marine encrustations are generally made up of several minerals depending on the soil and other conditions. And those colours suggest it is a mix of materials, including something that looks like copper oxidation. </p><p>You would have to have it tested to know if it is pure calcium carbonate and if so, why it has those colours.[/QUOTE]</p><p><br /></p>

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