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<p>[QUOTE=&quot;all_fakes, post: 254096, member: 55&quot;]Different folks seem to have different terminology, and terminology may vary in other languages. But in mineralogical terms, in English, agate is simply one variety of chalcedony. No more, no less.&nbsp;&nbsp; All agates are chalcedony, but not all chalcedony is agate.</p><p>Most rockhounds would be happy to refer to this inclusion as either agate or chalcedony. Most or many agates are banded when cut and polished, and many are grey; such as Botswana agate.&nbsp; See <a href="https://en.wikipedia.org/wiki/Agate" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://en.wikipedia.org/wiki/Agate" rel="nofollow">https://en.wikipedia.org/wiki/Agate</a> for some discussion of types of agates and their formation process.</p><p>&nbsp;&nbsp; The rock in AJ&#039;s second photo would be identified by most rockhounds and mineralologists (in the US) as a variety of chalcedony commonly called agate;&nbsp; very similar to Botswana agate, though online that specimen appears to have been identified as &quot;Chalcedon&quot; by a museum in Prague.</p><p>(In English, &quot;chalcedony is the mineral; &quot;Chalcedon&quot; was a city in the Byzantine Empire.&nbsp; Not so in other languages, however.)</p><p><br /></p><p>[ATTACH=full]78635[/ATTACH]</p><p>Botswana agate[/QUOTE]</p><p><br /></p>

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