A metamorphic facies is a set of metamorphic mineral assemblages that were 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 at right). Rocks which contain certain minerals can therefore be linked ...
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http://en.wikipedia.org/wiki/Metamorphic_facies
(from the article `metamorphic rock`) Metamorphic petrologists studying contact metamorphism early in the 20th century introduced the idea of metamorphic facies to correlate metamorphic ... In 1915 the Finnish petrologist Pentii E. Eskola set up a classification scheme for metamorphic rocks that was based on metamorphic facies. Each ......
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http://www.britannica.com/eb/a-z/m/78
A set of metamorphic mineral assemblages, repeatedly associated in space and time, such that there is a constant and therefore predictable relationship between mineral composition and chemical composition. That relationship is a consequence of conditions of temperature and pressure under which the assemblages are stable.
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https://www.encyclo.co.uk/local/22327
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