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<p>[QUOTE=&quot;2manybooks, post: 10776899, member: 8267&quot;]I can highly recommend a book (!) by Maggie Campbell Pedersen: <u>Gem and Ornamental Materials of Organic Origin</u>. revised edition, 2010. ISBN 9780719804212</p><p>Available as a hardcover book - </p><p><a href="https://www.bookfinder.com/search/?keywords=9780719804212&amp;currency=USD&amp;destination=us&amp;mode=advanced&amp;il=en&amp;classic=off&amp;lang=en&amp;st=sh&amp;ac=qr&amp;submit=" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://www.bookfinder.com/search/?keywords=9780719804212&amp;currency=USD&amp;destination=us&amp;mode=advanced&amp;il=en&amp;classic=off&amp;lang=en&amp;st=sh&amp;ac=qr&amp;submit=" rel="nofollow">https://www.bookfinder.com/search/?keywords=9780719804212&amp;currency=USD&amp;destination=us&amp;mode=advanced&amp;il=en&amp;classic=off&amp;lang=en&amp;st=sh&amp;ac=qr&amp;submit=</a> </p><p><br /></p><p>and as a less expensive PDF. (this turned up while doing a search, and I cannot personally vouch for it)&nbsp; -</p><p><a href="https://www.magicianpalace.com/gem-and-ornamental-materials-of-organic-origin-p-1601.html" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://www.magicianpalace.com/gem-and-ornamental-materials-of-organic-origin-p-1601.html" rel="nofollow">https://www.magicianpalace.com/gem-and-ornamental-materials-of-organic-origin-p-1601.html</a></p><p><br /></p><p>She provides an excellent discussion of the nature, use, and identification of tortoiseshell (among other materials). I will reproduce one page here, to show the type of information included, which addresses many of the questions we have raised here. She also has chapters on horn, as well amber &amp; copal, jet, ivory, bone, antler, rhino horn, pearl, shell and coral.</p><p><br /></p><p>[ATTACH=full]534309[/ATTACH][/QUOTE]</p><p><br /></p>

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