Reply by RichardB

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Posted on Sandpaper Grit?

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70 posts in 2526 days

#1 posted 11-17-2008 01:21 AM

Quartz is just the material; it’s crushed rock instead of aluminum oxide or whatever.

PS: I did a little more looking and found this “Flint (or flintstone) is a hard, sedimentary cryptocrystalline form of the mineral quartz.” Flint paper I’ve heard of; I think I have some ancient 36 grit stuff out in a drawer somewhere in the garage.

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