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What kind of metal in this Alum Shale?

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enanthate (OP)

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What kind of metal in this Alum Shale?

« on: 13/09/2018 08:09:27 »

Hi,

Found this piece at an alum shale dig site in downtown Oslo. I noticed these tiny nuggets of metal in the shale. Any idea what kind of metal it is?

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Re: What kind of metal in this Alum Shale?

« Reply #1 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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