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Calculate the density of a rock composed of the four minerals listed below together with their abundances and densities.
Mineral
Abundance by volume, %
Density g/cm3
Olivine
15
3.30
Augite
50
3.20
Plagioclase
25
2.68
Magnetite
10
5.18
Hint: The total mass of the rock is the sum of the masses of its minerals
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