Understanding porosity and density
Grain density describes the density of solid or mineral grains of the rock.. Grain density can give an indication of the mineralogy of the rock: Dolomite, ρ = 2.8–3.1 g/cm 3 Shales, ρ = 2.65–2.8 g/cm 3 Shales are composed of several minerals that have different densities in different relative amounts.