What does the presence of the index mineral, chlorite, in a metamorphic rock indicate?

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The rock has experienced a lower degree of metamorphism (low grade metamorphism) with lowest of pressure and temperatures for metamorphism.

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The rock has experienced a greater degree of metamorphism (high grade metamorphism) with higher pressure and temperatures.

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The rock has experienced a intermediate degree of metamorphism (medium grade metamorphism) with mid-ranging pressure and temperatures for metamorphic conditions.

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What does the presence of the index mineral, chlorite, in a metamorphic rock ind...

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