Phyllite’s protolyth, or parent rock,is shale. Phyllite is very abundant metamorphic rock in the word. Phyllite is a fined grained metamorphic rock. Fine-grained quartz and feldspar are often abundant in phyllite. Phyllite is formed from the advanced metamorphism of slate. Slate has fine clay flakes which is oriented but with the phyllite it has fine grained mica flakes that are oriented. Question: How is phyllite formed? In thin section, the microtexture is dominated by muscovite and quartz grains formed during low grade metamorphism and compositional bands that reflect the original sedimentary layering. In the eastern part, bedrock is overthrusts of phyllite and mica schist. Create your account. As phyllite weathers it parts along the cleavage planes. Phyllite is a fine-grained metamorphic rock formed by the low grade metamorphism of fine-grained, sedimentary rocks, such as mudstones or shales. Phyllites and slates are fine-grained metamorphic rocks that may produce very thick saprolite zones (Zauyah, 1986; Felix-Henningsen, 1994).In a tropical environment, the saprolite is composed of fine-grained quartz and sericite aligned according to the original schistosity (Zauyah, 1986; Stoops et al., 1990) (Fig. All other trademarks and copyrights are the property of their respective owners. Various kinds of gneiss are common. A defining characteristic is the shiny surface, called phylitic luster caused by the mica particles within the rock. Shale is a fine-grained sedimentary rock which is formed by the compaction of silt and clay-size mineral particles. An examination of geological thin sections of the mineral phyllite using polarizing microscopy, as well as providing information on component minerals, can reveal a great deal about how the rock was formed. Phyllite is formed by relatively low-grade metamorphic conditions in the lower part of the greenschist facies.Parent rocks may be only partially reconstituted so that the original mineralogy and sedimentary bedding are partially preserved. The term (from the Greek phyllos, leaf, a reference to its characteristic cleavage) was first used by C. F. Naumann in the late 1850s, but the original reference is lost. The diagram above shows a cross-section through a portion of Earth’s crust. The protolith (or parent rock) for a phyllite is a slate. Whereas slate has a dull surface because its metamorphic minerals are extremely fine-grained, phyllite has a sheen from tiny grains of sericitic mica , graphite, chlorite and similar minerals. Phyllite is a metamorphic form of shale, mudstone, and siltstone. Phyllite - Kilmacrenan. Phyllite is a stripped rock made of thin bands of quartz, mica, and chlorite. Phyllites are formed through low-grade regional metamorphism. You can also know more about Shale and Phyllite Reserves. Albite, Alusite, Amphibole, Apatite, Biotite, Chlorite, Epidote, Feldspar, Garnet, Graphite, Hornblade, Kyanite, Micas, Muscovite or Illite, Porphyroblasts, Quartz, Sillimanite, Staurolite, Talc, Zircon, Chemical Erosion, Coastal Erosion, Glacier Erosion, Water Erosion, Wind Erosion, Biological Weathering, Chemical Weathering, Mechanical Weathering. It is foliated, meaning that it has noticeable layers, and splits easily. Phyllite is considered a foliated metamorphic rock. Phyllite is a fine grained metamorphic rock that resembles its sedimentary parent rock, shale. These mineral grains are usually smaller than what can be easily seen with the unaided eye. Services, Classification of Metamorphic Rocks: Texture & Parent, Working Scholars® Bringing Tuition-Free College to the Community. The aggregate minerals forming the rock are held together by chemical bonds.

how is phyllite formed

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