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<p>[QUOTE=&quot;Bronwen, post: 4627574, member: 5833&quot;]<a href="https://cameotimes.com/index.php/reference/materials-guide?start=3" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://cameotimes.com/index.php/reference/materials-guide?start=3" rel="nofollow">&#039;Lava&#039; as used in the cameo realm</a> is not the pumice-y stuff we tend to associate with that word.&nbsp; Although varying, all of it is finer grain than that.&nbsp; This is solidified ash from the eruptions of Vesuvius.&nbsp; The smaller the grains of dust, the farther the wind could carry them away before they settled out.</p><p><br /></p><p>The part of Italy that includes the volcano sits on a shield of limestone, so I would expect that a fair bit of this gets blasted out in a pyroclastic event.&nbsp; Some people test for lava by dropping lemon juice or vinegar on it to see if it bubbles, revealing its calcium carbonate nature.</p><p><br /></p><p>Since marble is metamorphic limestone, surprised it would test as quartz, unless that mineral occurs as inclusions, perhaps in fossil material.[/QUOTE]</p><p><br /></p>

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