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I found this rock in my back yard. I suppose it has been there for ages. It weighs about 10 kg and when I tried to cut it with machinery, I couldn't.

Some facts about the rock:

  • I live in Cyprus.
  • It has the size of a head of a 7-year-old kid.
  • It weighs around 10 kg.
  • I used a hand cutting machine like the one in this photo.

Any thoughts?

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closed as off-topic by Leukocyte, Fred, trond hansen, Gimelist, uhoh Jul 19 at 11:27

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." – Leukocyte, Fred, trond hansen, Gimelist, uhoh
If this question can be reworded to fit the rules in the help center, please edit the question.

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I believe it is a very large chert nodule that has weathered out of limestone. Was it found near the limestone area of the island?

The hardness indicates it isn't a concretion. If your saw blade did not have carbide or diamond on the edge, it wouldn't cut chert which is a type of fine-crystal quartz.

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