Schist is a medium-grained strongly-foliated crystalline metamorphic rock, formed by dynamic metamorphism, that can be readily split into thin flakes or slabs due to the well-developed parallelism of more than 50% of the minerals present, particularly those of lamellar or elongate prismatic habit, e.g., mica and amphiboles.

Chlorite schist: A schist with chlorite as the dominant visible mineral is known as a "chlorite schist." The specimen shown is about two inches (five centimeters) across. How Does Schist Form? Schist is a rock that has been exposed to a moderate level of …

Greenschist, formed by metamorphism of basalt or other low-silica volcanic rock, typically contains significant amounts of chlorite. Chlorite minerals show a wide variety of compositions, in which magnesium, iron, aluminium, and silicon substitute for each other in the crystal structure.

2023年8月26日 · Chlorite: Chlorite minerals give chlorite schist its green color and are responsible for its characteristic texture. Amphibole Minerals : Amphibole minerals like hornblende and actinolite can be present in schist, contributing to its color and cleavage patterns.

Chlorite minerals are found in rocks altered during deep burial, plate collisions, hydrothermal activity, or contact metamorphism. They are also found as retrograde minerals in igneous and metamorphic rocks that have been weathered. Rocks that commonly contain abundant chlorite include greenschist, phyllite, chlorite schist, and greenstone.

2023年9月9日 · Key characteristics of chlorite minerals include their platy or micaceous texture and a tendency to occur in thin, flexible flakes. They are often associated with rocks like schist, slate, and phyllite.

Schist is a type of metamorphic rock known for its distinctive layered or banded appearance. This characteristic, called foliation. This foliation is caused by the alignment of platy minerals, such as mica, chlorite, and talc, being flattened and aligned due to …

Common minerals include chlorite, biotite, muscovite, garnet, and hornblende. Recognizable minerals used as part of rock name. Porphyroblasts common. Mica schist: Siltstone or shale: Garnet schist: Gneissic banding. Coarse-grained. Foliation present as minerals arranged into alternating light and dark layers giving the rock a banded texture in ...

A schistose metamorphic rock with chlorite minerals as the major (>50%) constituent. Chlorite imparts a schistosity by parallel arrangement of its flakes. Quartz, epidote, magnetite, and garnet may be accessories, the last two often as conspicuous porphyroblasts.

Type Metamorphic Rock Texture Foliated; Fine- to medium-grained Composition Chlorite Index Minerals Chlorite Color Green Metamorphic Type Regional Metamorphic Grade Low Grade (Low P – Low T) Parent Rock Shale or Mudstone Metamorphic Environment Low grade regional metamorphism along a convergent plate boundary