Uniformity of composition throughout) plus the diploma of isotropy. The latter is the extent to which the bulk framework and composition are a similar in all directions from the rock. Igneous rocks are people who solidify from magma, a molten combination of rock-forming minerals and usually volatiles for example gases https://rocksticks90011.blogdomago.com/35095811/how-rock-sticks-can-save-you-time-stress-and-money