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Depends upon the two rocks and where they are. You will get dust as one stone wears away the other, or they wear away each other depending on the comparative density. Two rocks in a tumbling drum will slowly round each other off, creating smooth roundish stones. If one has iron content, and the other flint, you could create some sparks that could be used to make a fire. If the rocks are coal, you could get a very fine coal dust that can be lit with a match.

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Ambrose Krajcik

Lvl 13
3y ago

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