Hi geek,
The hardest mineral in the world is diamond. Of course, you don’t get rocks formed from diamonds. Probably the hardest mineral that forms rocks is quartz, so any rock with a lot of quartz in it would be the hardest. Granite has a lot of quartz, as does quartzite, so one of those I think
Hi geek52 … hardest mineral is indeed diamond but i’d agree with James V and say rocks with lots of quartz contained in them are the hardest … so i’d say quartzite is the hardest rock
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