Kyanite, Andalusite, and Sillimanite are what type of minerals?

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Study for the ASBOG Fundamentals of Geology exam. Access flashcards, multiple-choice questions, and understand key geologic principles. Prepare confidently for your exam!

Multiple Choice

Kyanite, Andalusite, and Sillimanite are what type of minerals?

Explanation:
These minerals are polymorphs of the same chemical formula, Al2SiO5. That means they have identical chemical composition but different crystal structures that are stable under different pressure–temperature conditions. Kyanite, andalusite, and sillimanite form from the same material, changing structure as metamorphic conditions change, so they’re categorized as polymorphs. While they’re all silicates in composition, the key idea is that the same formula can crystallize into three distinct forms, not that they’re different kinds of silicate. They aren’t isotopes or native elements.

These minerals are polymorphs of the same chemical formula, Al2SiO5. That means they have identical chemical composition but different crystal structures that are stable under different pressure–temperature conditions. Kyanite, andalusite, and sillimanite form from the same material, changing structure as metamorphic conditions change, so they’re categorized as polymorphs. While they’re all silicates in composition, the key idea is that the same formula can crystallize into three distinct forms, not that they’re different kinds of silicate. They aren’t isotopes or native elements.

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