Melting of two crystalline phases or reactions between them

5 Melting of two crystalline phases or reactions between them 

Wo is not necessarily midway between Wa and Wb- If and are known, Wq may be solved from the above equation. Then both melting rates may be calculated. The ratio of the two melting rates is 

If there are many grains of anorthite and titanite in a melt matrix, then the total mass dissolution rate of anorthite is 

4 Reaction between two solid phases in the presence of a fluid phase 

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