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Geology, Palaeontology & Archaeology / Re: What is this spherical, metallic rock?
« on: 10/10/2016 15:06:34 »
maybe a pyrite nodule aka fools gold. FeS2, density about 5g/cc "feels heavy" for it's size, not much attraction to a magnet, black streak on porcelain. pyrite crystals are pretty yellow but I've seen some nodules with just a slight yellow color.