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<p>[QUOTE=&quot;hotwheelsearl, post: 7544606, member: 75143&quot;]I wish I knew how/why those minerals form. I suppose the base metal, copper is already pretty reactive so it’s already prone to oxidizing.</p><p><br /></p><p>I believe that the minerals of malachite and azurite often form in conjunction; not sure about cuprite but they’re all there. This coin has probably 90% malachite 8% azurite and 1% cuprite, but why those ratios is beyond me. I’ve seen some coins with a much higher rate of azurite, and some with no malachite at all.</p><p><br /></p><p>The problem is, with many Chinese coins, they are unprovenanced so nobody can really tell from what region/locale they were found. </p><p><br /></p><p>patinas will certainly vary from location and often have a look unique to a specific place (ie Boscoreale patina is typically only found on those coins found in Boscoreale; Tiber patina is often found in rivers, though not necessarily always the Tiber)[/QUOTE]</p><p><br /></p>

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