I wonder which rock is most resistant to being cracked apart by a hammer, in other words, what is the toughest rock? What rock is most difficult to mine through? Hardness is different than toughness, and I am asking what is the toughest kind of rock?

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    $\begingroup$ From my own experience, the dunites in Cyprus were particularly resistant to my sledgehammer strikes $\endgroup$ – Gimelist Jan 11 at 23:38
  • $\begingroup$ @Gimelist, Cool, but what do they look like? $\endgroup$ – Asadefa Jan 12 at 1:57
  • $\begingroup$ Like this duckduckgo.com/?q=dunite+cyprus&ia=images&iax=images $\endgroup$ – Gimelist Jan 12 at 2:45
  • $\begingroup$ Eclogites and banded iron formations come to mind as being a particular pain to break with a hammer. Also from my own experience. $\endgroup$ – Geochron Jan 14 at 11:04

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