Changes in temperature result in thermal expansion . Hot objects expand Cold objects contract Expansion occurs at the mineral scale . Dissolution Equation Formation of carbonic acid occurs naturally. Carbonic acid reacts with calcite to breakdown the mineral into ions. Hydrolysis Hydrolysis is the process by which aluminum rich felsic minerals breakdown to form clay.
Process occurs in the upper few meters of the Earth s surface.
Important for providing potassium nutrients to plants. Important in providing silica for shell animals. Hydrolysis Equation Potassium feldspar breaks down in the presence of water forming a clay mineral. Silica provides cement for bonding grains in sedimentary rocks. Note minerals that contain both Al and Fe will undergo both oxidation and hydrolysis.