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Usually the slower the rock cools the bigger the xtls grow. Fast cooling results in little or no xtl growth. Xtls take time to grow and the right amount of heat. Thats why most rock or minerals...

So whats the big deal with the hanging hair test. You guys are so fixated with the test I don't hear about whether the razor shaves well or not. If it does who cares about the test.

Personally,...