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<p>[QUOTE=&quot;Andere, post: 9767533, member: 85752&quot;]Richardson&#039;s Rock Ranch thunder egg, from central Oregon. Because the rock forms as a kind of spherical crystal/bubble in lava, the repeating pattern on the outside is very regular and you&#039;ll see it on thousands of eggs from that location. No words or artist involved, just volcanic process! Collectors often try and collect distinct specimens from around the world, as each volcanic event leaves its own &quot;stamp&quot; on the eggs formed there.[/QUOTE]</p><p><br /></p>

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