Quartz and elements such as gold are sometimes found in veins in igneous rocks. What best explains how the veins form? Group of answer choices Fluids rich in feldspar bond with the leftover elements in magma. Fluids rich in pegmatites do not mix with the magma. Fluids rich in water mix with the magma. Fluids rich in silica, water, and leftover elements crystallize late in magma formation.