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<p>[QUOTE=&quot;desertgem, post: 4435275, member: 15199&quot;]I do not think it is granite or quartzsite and almost any strong chemical would attack the weakest chemical part ( metal coin) first. If you can physically chip off the material to satisfy you that is probably the only one. If the contaminant found a way in cracks or flakes on the coin, it has probably formed similar matrix inside.Archeologists also sometimes resorts to rotary dental burrs to remove matrix around fossils. One thing I find hard but necessary, is to give up on curiosity when it costs more time and money than it is worth. Good luck, Jim[/QUOTE]</p><p><br /></p>

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