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I've found leaves in the shape of every known subtype in name e ology... Sometimes they look good enough to get the heart pumping. Then again sometimes those 6.5 inch leaves are rhyolite after being poked by a walking stick!
Old rubber pieces that come off tractor tires looks just like black flint in a plowed field. Believe it or not the old rubber hardens like a rock and can take the shape of many things but it feels lighter like coal when you pick it up. Usually have to put fire to it to positively identify.
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