Schist

thumb|A schist showing characteristic scaly schistose texture caused by platy mica|micas Schist ( ) is a medium-grained metamorphic rock generally derived from fine-grained sedimentary rock, like shale. It shows pronounced schistosity (named for the rock). This means that the rock is composed of mineral grains easily seen with a low-power hand lens, oriented in such a way that the rock is easily split into thin flakes or plates. This texture reflects a high content of platy minerals, such as mica, talc, chlorite, or graphite. These are often interleaved with more granular minerals, such as fel

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

thumb|right|Blueschist on Île de Groix, France thumb|right|Photomicrograph of a [[thin section of blueschist facies metamorphosed basalt, from Sivrihisar, Turkey]]