greenschist

thumb|right|chlorite group|Chlorite [[schist, a type of greenschist]] thumb|Greenschist (prasinite) at Cap Corse in Corsica, France thumb|Greenschist (epidote) from Itogon, Benguet, Philippines

Greenschists are metamorphic rocks that formed under the lowest temperatures and pressures usually produced by regional metamorphism, typically and 2–10 kilobars (). Greenschists commonly have an abundance of green minerals such as chlorite, serpentine, and epidote, and platy minerals such as muscovite and platy serpentine. The platiness gives the rock schistosity (a tendency to split into layers). Other common minerals include quartz, orthoclase, talc, carbonate minerals and amphibole (actinolite).