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Metamorphic facies is a fundamental concept in petrology that helps in understanding the conditions under which metamorphic rocks form. It refers to a set or group of metamorphic mineral assemblages that are stable under a specific range of pressure and temperature conditions during metamorphism. These mineral assemblages serve as indicators of the metamorphic environment, allowing geologists to interpret the pressure-temperature history and tectonic setting of metamorphic rocks. The concept was introduced by Pentti Eskola in the early 20th century, who recognized that different metamorphic minerals coexist in rocks formed under similar metamorphic conditions. He categorized rocks into distinct ____ _________ ________ ____ __________ _____ ______ __________.
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