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Watch the Lithium it causes Kidney failure after years of use.

Really you don't need to fret about this stuff. Just do a little reading here and use what the majority use and you will be fine. if...

Alumina is way softer than diamond so it will cut slower. However there are guys here who have used it and I'm sure one will come along.

If you get alumina get levigated alumina. it won't clump.