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Message: mzsmith how sure are you?
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re:  2.5 t / m**3 rock density 

Different rock has different densities, but that is about correct.

Rule of thumb:  water less dense than rock, 1 t / m**3.  steel more dense than rock, 10 t / m**3.

Wikipedia for quartz:  specific gravity of 2.65

Given the various impurities (e.g. gold!!!!) the density varies a good bit.  Not point gettig fancier than that.

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