Explain crystallisation behaviour of binary system with complete solid solution of two end members with the help of neat well labelled diagrams.

In petrology, the crystallization behavior of a binary system with complete solid solution of two end members can be understood using a binary phase diagram. A binary system consists of two components that form a continuous series of solid solutions. A classic example is the plagioclase feldspar series, which ranges from albite (NaAlSi₃O₈) to anorthite (CaAl₂Si₂O₈).

Phase Diagram of a Binary System with Complete Solid Solution

A binary phase diagram for such a system consists of:

1. Liquidus Curve – The boundary above which only liquid exists.
2. Solidus Curve – The boundary below which only solid exists.
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