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