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Specific gravity?

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What is the average specific gravity of rock forming minerals? Do any minerals have a specific gravity less than 1? Calculate the specific gravity of a mineral specimen that weights 280 grams and displaces 100 cubic centimeters of water.

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  1. Generally the specific gravity of rock is about 5

    Yes pumice has a SG <1. It will float on water

    SG = 280g/100cm^3= 2.8

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