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<p>[QUOTE=&quot;Ce BCA, post: 4404927, member: 18716&quot;]Yep the naming system is a complete mess due to people not realising many crystals were the same thing back in the day as they were unable to test effectively.&nbsp; I think there are about 30 names for chalcedony now, and calcedony itself is a form of quartz.&nbsp; Then there all the modern egregious names which are pure marketing crap.</p><p><br /></p><p><br /></p><p><br /></p><p>My references suggest black inclusions in these are usually hydrocarbon which is interesting - so coal or even some oil in liquid phase inclusions.[/QUOTE]</p><p><br /></p>

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