Day #119 Deskcrop: Powell Kyanite Schist (Thin Section)

Sticking with the metapelites, today’s thin section “deskcrops” are from the Powell kyanite schist featured on April 16th. How many minerals can you identify in this thin section? Can you narrow down the range of P,T at which it last equilibrated? Bonus points for applying the phase rule – show your work! (Assume the rock is described by the components KFMASH.)

Powell Kyanite Schist, Plane Light

Powell Kyanite Schist, X-Polars

Explore this and all of my 2010 Deskcrops and Outcrops in Google Earth!

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