1
$\begingroup$

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

enter image description here

$\endgroup$

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
If this question can be reworded to fit the rules in the help center, please edit the question.

3
$\begingroup$

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.

$\endgroup$

Not the answer you're looking for? Browse other questions tagged or ask your own question.