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<p>[QUOTE=&quot;gxseries, post: 2020281, member: 4373&quot;]Without seeing the rock sample in hand, it&#039;s hard to tell what it is. It does feature some grainy texture on first glance. </p><p><br /></p><p>That said, I do not think this was pressed into a warm lava for two reasons: </p><p><br /></p><p>1) The temperature of lava should be easily 700c to 1000c+. Regardless of how copper melts at a higher temperature of let&#039;s say 1000c, there doesn&#039;t seem to be any kind of &quot;heat toned&quot; damage on the coin. </p><p><br /></p><p>2) The insertion of the coin in the rock looks way too circular. It reminds me of a clock on mineral samples like this example:</p><p><br /></p><p><a href="http://www.ebay.com/itm/245Gram-Extremely-Rare-Watch-Fix-In-Onyx-Through-Carving-Table-Clock-Pakistan-/261219603567?pt=Antiques_Decorative_Arts&amp;hash=item3cd1e6d46f" target="_blank" class="externalLink ProxyLink" data-proxy-href="http://www.ebay.com/itm/245Gram-Extremely-Rare-Watch-Fix-In-Onyx-Through-Carving-Table-Clock-Pakistan-/261219603567?pt=Antiques_Decorative_Arts&amp;hash=item3cd1e6d46f" rel="nofollow">http://www.ebay.com/itm/245Gram-Extremely-Rare-Watch-Fix-In-Onyx-Through-Carving-Table-Clock-Pakistan-/261219603567?pt=Antiques_Decorative_Arts&amp;hash=item3cd1e6d46f</a></p><p><br /></p><p>Russia is well known for such clocks. That said, regardless of how the coin ended up to be in the rock, it&#039;s still pretty neat.[/QUOTE]</p><p><br /></p>

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