Metamorphic facies

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What Wikipedia says

A metamorphic facies is a set of mineral assemblages in metamorphic rocks formed under similar pressures and temperatures. The assemblage is typical of what is formed in conditions corresponding to an area on the two dimensional graph of temperature vs. pressure (See diagram in Figure 1).

Excerpt from the Wikipedia article “Metamorphic facies”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Salsero35, CC BY-SA 4.0, via Wikimedia Commons.