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<p>[QUOTE=&quot;Any Jewelry, post: 381724, member: 2844&quot;]Geologically speaking you are right, obb. What is commonly called lavastone in jewellery is in fact volcanic breccia, formed by lava, and tuff, volcanic ash consolidated into stone. There are different kinds of tuff.</p><p>So technically/geologically speaking it is tuff or breccia, in jewellery terms it is lava, which volcanic breccia is (with other volcanic rocks added to the lava).</p><p>As you know many jewellery terms are invented just to confuse us.<img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie75" alt=":playful:" unselectable="on" unselectable="on" /> This is just one of those cases.</p><p><br /></p><p>Tuff can also be quite porous. I guess it depends on the level of compression, but I leave that to the geologists among us.</p><p>In case anyone is wondering, tuff is not tufa. It is what Italians call tufo, one letter difference.[/QUOTE]</p><p><br /></p>

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