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<p>[QUOTE=&quot;Bronwen, post: 339218, member: 5833&quot;]Wonder if we&#039;re using the words &#039;obsidian&#039; &amp; &#039;onyx&#039; the same way.&nbsp; Obsidian is volcanic glass, brittle, easily fractured, &amp; , according to my mineral guide, 5 - 5.5 on the Moh&#039;s scale.&nbsp; Black onyx is chalcedony dyed to that color; same guide puts it at 6.5 - 7 on the scale.&nbsp; (Same guide puts turquoise 5 - 6.)&nbsp; The more durable black onyx is used in jewellery so much more than the fragile obsidian, odds are the stone is the former, particularly if it is opaque seen from the edge.[/QUOTE]</p><p><br /></p>

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