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That's why I said it's not a degree thing. You can take a massive chunk of basalt which is pretty solid stuff and rub it with aluminum oxide and it will break down but that's not friable in any way...

Friable refers to stones or rocks that are comprised of particles loosely cemented together so if you rub the stone with your hand they particles come off. It's not a degree thing. When a stone...

I sometimes wonder who comes up with these terms. Friable grit theory? Sandstone is friable. A coticule is not.