We have talked about in lecture about metamorphic grade, and about the difference between prograde and retrograde mineral reactions. One such possible mineral reaction is as follows: orthoclase + sillimanite + H2O = muscovite + quartz 3a: Write a balanced chemical reaction for the above minerals, given that the formula for muscovite is K2Al6Si6O20(OH)4  3b: Indicate which reaction direction (left to right, right to left) is the prograde direction, and explain why you think that.

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We have talked about in lecture about metamorphic grade, and about the difference between prograde
and retrograde mineral reactions. One such possible mineral reaction is as follows:
orthoclase + sillimanite + H2O = muscovite + quartz


3a: Write a balanced chemical reaction for the above minerals, given that the formula for muscovite is
K2Al6Si6O20(OH)4 


3b: Indicate which reaction direction (left to right, right to left) is the prograde direction, and explain
why you think that. 

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