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    Senior Member MrRyder's Avatar
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    I've actually wondered that as well. I've even considered taking a basic geology course just for interest.

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    Senior Member blabbermouth ace's Avatar
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    Well, I lapped a Norton 220 on my sidewalk once. Does that count?

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    Senior Member blabbermouth RezDog's Avatar
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    I'm with you guys. I live in an area with a lot of shale, different types of slate, petrified wood and basalt. I've heard of all of this types being hone material. My question is similar, which one, what is the science?
    Suile likes this.

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