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<p>[QUOTE=&quot;Kentucky, post: 2425260, member: 33176&quot;]Have never worked with X-ray diffraction, but from my readings and from people I know, there is powder X-ray diffraction and single crystal.&nbsp; This would not be an analysis of any use with coins, I&#039;m not sure if this would read anything on the surface.&nbsp; OTOH, XRF is a surface analysis and doesn&#039;t penetrate to any appreciable extent.&nbsp; XRF is best for heavy elements, generally metals.&nbsp; For example if you had a patina of copper carbonate, XRF would tell you there is copper there.&nbsp; I was supervisor in a lab where we had one, I never ran it except in one instance where we had visited the Grand Canyon and I kicked something in the parking lot that rang.&nbsp; I picked it up and thought it was some slag aluminum.&nbsp; I ran an XRF on it and it turned out to be silver.[/QUOTE]</p><p><br /></p>

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