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Dutchess County, NY

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2.8c Questions (continued)

(3) What mineral expected in metamorphosed shales is missing in sample DC-02?

Enter the mineral name or abbreviation and press "Enter."

Yes! Typical metamorphosed shales are rich in aluminum and have muscovite (Ms) in abundance until the metamorphic conditions get hot enought to lead to the breakdown of Ms and, in many cases associated partial melting. Sample DC-02 has no muscovite. It does have plagioclase.

Your answer is incorrect. The missing mineral is present in all of the other samples. Please try again.

(3) What mineral expected in metamorphosed shales is missing in sample DC-02?

Enter the mineral name or abbreviation and press "Enter."

Yes! Typical metamorphosed shales are rich in aluminum and have muscovite (Ms) in abundance until the metamorphic conditions get hot enought to lead to the breakdown of Ms and, in many cases associated partial melting. Sample DC-02 has no muscovite. It does have plagioclase.

No. You still have not given the correct answer. Typical metamorphosed shales are rich in aluminum and have muscovite (Ms) in abundance until the metamorphic conditions get hot enought to lead to the breakdown of Ms and, in many cases associated partial melting. Sample DC-02 has no muscovite. It does have plagioclase.

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Igneous and Metamorphic Rocks