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Geology, Palaeontology & Archaeology / Re: What kind of metal in this Alum Shale?
« on: 16/09/2018 00:39:50 »
Pyrite, or Fool's Gold. The cubic form is the real give-a-way. Black shales like this are commonly deposited in anoxic conditions, making iron sulfides more likely to form than iron oxides.
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