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<p>[QUOTE=&quot;moreotherstuff, post: 5676, member: 56&quot;]I bought these at a trift store. I think they are 2 halves of the same shell (about 5&quot; across), possibly nautilus but could be ammonite:</p><p><br /></p><p><img src="http://img.photobucket.com/albums/v337/hoozzatt/Temp/FossilAmmoniteNautilusShellPairOpalised-b_zps95e1b453.jpg" class="bbCodeImage wysiwygImage" alt="" unselectable="on" /> </p><p><br /></p><p><img src="http://img.photobucket.com/albums/v337/hoozzatt/Temp/FossilAmmoniteNautilusShellPairOpalised-a_zps967234ed.jpg" class="bbCodeImage wysiwygImage" alt="" unselectable="on" /> </p><p><br /></p><p>These things aren&#039;t exactly uncommon.&nbsp; You can easily find them on eBay.&nbsp; They mostly seem to come from Madagascar.</p><p><br /></p><p>The inside cells were partly hollow with a light crystal coating, a bit like a geode:</p><p><img src="http://img.photobucket.com/albums/v337/hoozzatt/Temp/FossilAmmoniteNautilusShellBBB-b_zps6e8e7346.jpg" class="bbCodeImage wysiwygImage" alt="" unselectable="on" /> </p><p><br /></p><p>The patterning on the outsides can be very elaborate:</p><p><img src="http://img.photobucket.com/albums/v337/hoozzatt/Temp/FossilAmmoniteNautilusShellBBB-e_zps3e6aaaec.jpg" class="bbCodeImage wysiwygImage" alt="" unselectable="on" /> </p><p><br /></p><p>This one seemed to be opalized.&nbsp; Moving it around in the light gave flashes of bright red:</p><p><img src="http://img.photobucket.com/albums/v337/hoozzatt/Temp/FossilAmmoniteNautilusShellBBB-f_zps4628f8c0.jpg" class="bbCodeImage wysiwygImage" alt="" unselectable="on" /> </p><p><br /></p><p>I&#039;ve read that ammonites could grow to huge sizes - 10ft across.[/QUOTE]</p><p><br /></p>

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