Which of the metamorphic minerals shown in this diagram is stable under the high

Question

Which of the metamorphic minerals shown in this diagram is stable under the highest metamorphic grade? According to this diagram, which mineral tells the least amount of information about metamorphic grade? Increasing metamorphic grade Diagenesis Low Intermediate High Increasing metamorphic grade Greenschists Amphibolites Granulites Diagenesis Low Intermediate High Chlorite Greenschists Amphibolites Granulites Chlorite White mica (mainly muscovite Biotite White mica (mainly muscovite) Garnet Biotite Staurolite Garnet Staurolite Kyanite Sillimanite Kyanite Sillimanite Albite (sodium plagioclase) Albite (sodium plagioclase) With increasing metamorphic grade, mineral composition changes. With increasing metamorphic grade, mineral composition changes. Figure 7.29 The Eensl oSecen Edtion Figure 7.29e The Essensial Eorm, Second Edtion chlo sillimanite chlorite garnet kyanite staurolite kyanite albite

Explanation / Answer

Q) Which of the metamorphic mierals shown in this diagram is stable under the highest metamorphic grade ?

Ans. Sillimanite.

Q) According to this diagram, which mineral tells the least amount of information about metamorphic grade ?

Ans. albite.

Because it present throught the diagram. It present from diagenesis to high grade metamorphism. As metamorphic grade is identified on the basis of presence or absence of mimeral or mineral assemblage, so, albite tells the least amount of information about metamorphic grade.

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