Solvus
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In a physical or geochemical system, a solvus is a line (binary system) or surface (ternary system) on a phase diagram which separates a homogeneous solid solution from a field of several phases which may form by exsolution or incongruent melting. The line determines a solid solubility limit which changes as a function of temperature. it is a locus of points on equilibrium diagram An example is the formation of perthite when an alkali feldspar is cooled down.it defines limit of solid solubility in an equilibrium diagram
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