Please help me identify this rock. I’ve found it in a cave.

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closed as off-topic by arkaia, Fred, trond hansen, Peter Jansson, hichris123 Jan 7 at 6:34

This question appears to be off-topic. The users who voted to close gave this specific reason:

  • "Please review our rock identification guidelines to provide the missing information so that your question is both answerable and useful to new users." – hichris123
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It is almost certainly the mineral pyrite, based on the colour and the shape of the crystals. If so, rubbing it on unglazed porcelain will leave a black streak. It could also be chalcopyrite but that tends to look more yellow. It would help to know where exactly it was found.


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