Incongruent melting occurs when a solid substance being partially melted does not melt uniformly, so that the chemical composition of neither the resulting liquid nor the resulting solid is the same as that of the original solid. For example, melting of orthoclase (KAlSi3O8) produces leucite (KAlSi2O6) in addition to a melt.
Incongruent melting occurs when a solid substance being partially melted does not melt uniformly, so that the chemical composition of neither the resulting liquid nor the resulting solid is the same as that of the original solid. For example, melting of orthoclase (KAlSi3O8) produces leucite (KAlSi2O6) in addition to a melt.
Source: Wikipedia "Incongruent melting" · CC BY-SA 4.0
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