The large reddish crystals are garnet, and the surrounding light colored rock is dominated by muscovite mica. The Euro coin is 23 mm in diameter. Assume that the diameters of the garnets increased at a rate of 1 mm per million years. Based on the approximate average diameter of the garnets visible, estimate how long this metamorphic process might have taken. Show/explain how you arrived at your answer.
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The large reddish crystals are garnet, and the surrounding light colored rock is dominated by muscov...
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