The minerals andalusite, sillimanite, and kyanite all have the chemical formula, Al2SiO5. Explain how three different minerals can have the same chemical components and why this fact is important


Even thought andalusite, sillimanite, and kyanite have the same chemical formula, they differ in crystal structure and other physical properties because each forms under a different range of pressures and temperatures and is thus reflective of a different metamorphic grade. For this reason, they are useful index minerals for metamorphic rocks that formed from clay-rich rocks.

Environmental & Atmospheric Sciences

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Environmental & Atmospheric Sciences

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Environmental & Atmospheric Sciences

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Environmental & Atmospheric Sciences