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For a crystal fractionally melting in a Solid Solution Phase Diagram, beginning with a 50% rock.
   Imagine the system beginning with 40% anorthite which cools and crystallizes to 1400o. What will be the composition of the two fractions?

Answers: The Na rich fraction will have a composition of about 33% anorthoside (67% albite), and the Ca rich fraction will have a composition of about 74% anorthite.

Last Update: 9/29/00

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