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<p>[QUOTE=&quot;quick dog, post: 100441, member: 4093&quot;]Incredible.&nbsp; This thread caused me to review one of my old mineralogy books.&nbsp; I now must post a correction.&nbsp; I stated in another thread that native silver does not occur in nature.&nbsp; It does, but I have not seen naturally occuring native silver.&nbsp; Years ago, I purchased jewelry made from crystalline (0.999 pure) silver, but it was derived from a smelter in Idaho that has been closed for a long time.</p><p><br /></p><p>Native silver has been observed in small amounts along the edges of oxidized ore zones and in low-temperature thermal spring deposits.&nbsp; Native silver apparently occurs with native copper in the famous Keeweenaw Peninsula copper deposit of Michigan.&nbsp; I was underground at the White Pine Copper Mine in 1970.&nbsp; I saw lots of copper, but no native silver.</p><p><br /></p><p>There are several complex silver-X sulfides, and most are gray or black.&nbsp; However, cerargyrite (AgCl), which I have also seen and collected, is usually colorless or gray, but it apparently can be yellow, <b>green</b>, or brown.</p><p><br /></p><p>So I am guessing that the green stuff is massive cerargyrite.</p><p><br /></p><p>Which coin holders are PVC?&nbsp; What do they look like?&nbsp; How are they different from other plastic holders?&nbsp; I think that I may have some.&nbsp; Are the clear plastic (three-hole) sheets that we used to put 35-mm slides and photos in PVC?[/QUOTE]</p><p><br /></p>

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