greenschist facies

English - English

Definition of greenschist facies in English English dictionary

One of the major divisions of the mineral facies classification of metamorphic rocks, encompassing the rocks that formed under fairly low temperatures (480-660 °F, or 250-350 °C) and pressure conditions and usually produced by regional metamorphism. The minerals commonly found in such rocks include quartz, orthoclase, muscovite, chlorite, serpentine, talc, and epidote; carbonate minerals and amphibole (actinolite) may also be present

Hyphenation

greenschist fa·ci·es