Tougher Alternative Than Granite

Anyone who has a well-versed background in geology will know that the rock of the continents is granite.

It forms as lava cools down very slowly, creating large minerals and crystals that shielded the rock from cracking and thus the brunt of erosion. Granite also "floats", if you will, because despite its toughness, it's not dense like basalt, the rock of the oceans.

Now the question for continental makeup in an alternate Earth is this--is there a tough but still buoyant alternative to granite, preferably a rock tougher to resist against erosion than granite itself?

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Tougher Alternative Than Granite

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