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<p>[QUOTE=&quot;desertgem, post: 3204029, member: 15199&quot;]Maybe there some confusion over the term crystal. Most think of transparent material like Amethyst , Garnet,&nbsp; etc. But it is a chemical term of repetitive arrangements of atoms in a repetitive lattice that produces a macro structure arrangement that is visible. 90% of natural and man made substances we see are crystalline. So in your example, you would not see &#039;crystals&#039; as I mention above, but an arrangement that reflected the internal arrangement of the metal atoms Just as metals we are taking about in coins are not 100% pure, neither is the arrangement of the crystals. Although not used in coinage, Bismuth and antimony, show the lattice and crystalline arrangements extremely easily.</p><p><br /></p><p><a href="https://www.thoughtco.com/how-to-grow-bismuth-crystals-606234" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://www.thoughtco.com/how-to-grow-bismuth-crystals-606234" rel="nofollow">https://www.thoughtco.com/how-to-grow-bismuth-crystals-606234</a></p><p><a href="https://opentextbc.ca/chemistry/chapter/10-6-lattice-structures-in-crystalline-solids/" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://opentextbc.ca/chemistry/chapter/10-6-lattice-structures-in-crystalline-solids/" rel="nofollow">https://opentextbc.ca/chemistry/chapter/10-6-lattice-structures-in-crystalline-solids/</a></p><p><br /></p><p>I have no coin in the discussion, and I will stop here as the physical chemistry of some metals are rather odd.&nbsp;&nbsp; Jim[/QUOTE]</p><p><br /></p>

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