A Massive Mudstone Metamorphosed to Biotite Hornfels Facies Would Have

question 54

Multiple Choice

A massive mudstone metamorphosed to biotite hornfels facies would have ________.

• A) irregular spots of randomly oriented biotite platelets called porphyroblasts
• B) biotite defining wavy parallel foliations throughout the rock
• C) remnants of biotite, now mostly recrystallized to garnet in discreet layers
• D) breccia of angular biotite clasts crushed and sheared out of shape

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