Question:

Magnetic Granite Counter Top?

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What is it in granite counter tops that make magnets stick to it?

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  1. Probably magnetite, an Fe containing mineral. Iron oxide is a fair permanent magnet (ferrite magnets) so, if there is iron oxide in the granite, it will be weakly magnetic (unless the granite is laid on top of an Fe containing material and your magnet is actually attracted to what is below).

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