Compiled by Dexter Perkins (University of North Dakota) and John Brady (Smith College)
Equibria between calcite, quartz and wollastonite
Equilibrium phase relationships between calcite, quartz, wollastonite and CO2. Image courtesy of Darrell Henry.
Standard phase diagrams are graphical representations of the equilibrium relationships between minerals (or others phases). These relationships are governed by the laws of thermodynamics. Standard phase diagrams show how phases or phase assemblages change as a function of temperature, pressure, phase composition, or combinations of these variables.