Gold flake in iron stone - ROCKS, MINERALS and FOSSILS ...
All the silver I've seen as turned out to be mica. If you have a 40 X jewelers loupe, the mica usually looks less like mica and more like shiny saran wrap. There's been a few other minerals I've found that are silverfish which aren't mica. Iron Pyrite, fools gold, can look silverfish.
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