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<p>[QUOTE=&quot;Bronwen, post: 381941, member: 5833&quot;]Since I want to make sure I have it right on the web site, checked into this.&nbsp; Quick Googling seems to indicate that &#039;tufo&#039; is a word only in Spanish, &amp; that one meaning is the noxious gas given off by incomplete fermentation.&nbsp; Suspect volcanic fumes smell this way too.&nbsp; But if you want to find out about the volcanic material, you have to search for tuff or <a href="https://en.wikipedia.org/wiki/Tufa" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://en.wikipedia.org/wiki/Tufa" rel="nofollow">tufa</a>.</p><p><br /></p><p>Think there is a confounding factor when it comes to Vesuvian lava.&nbsp; Naples &amp; all southern Italy sits on a massive limestone shield.&nbsp; So when Vesuvius has a pyroclastic event, wouldn&#039;t be too surprising if a lot of what gets blasted out &amp; is light enough to be carried on the wind <i>is</i> calcareous.&nbsp; Have been told these cameos are limestone because they bubble when a bit of acid is dropped on them.&nbsp; Well, they are, just pulverized &amp; compressed again into an amorphous mass instead of the layers of limestone sediment.</p><p><br /></p><p>&#039;Lava&#039; is a non-specific term for anything solid that comes out of a volcano.[/QUOTE]</p><p><br /></p>

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