Other uses The result is the rock known as “phyllite”. Continued heat and chemical activity completed the clay-to-mica transformation and caused the mica grains to enlarge. It also shows one of the brown colors commonly seen on the surface of weathered phyllite. Low Grade (Higher than Slate), Metamorphic sheen rock. sheets), Grain size: Very
Phyllite is commonly found in the Dalradian metasediments of northwest Arran. Phyllite was originally a fine-grained sedimentary rock such as shale or mudstone, composed mainly of clay minerals in a semi-random orientation. Also, it may be used Phyllite: A specimen of phyllite that exhibits the lustrous and wrinkled surface common to this rock type. Metamorphic rocks are classified according to their texture. I am a foliated metamorphic rock. Phyllite is a fine-grained metamorphic rock with a well-developed laminar structure, and is intermediate between slate and schist rocks. The foliation is commonly crinkled or wavy in appearance. Protolith or Parent It formsIt forms when sedimentary rocks are buried and mildly altered by the heat anddirected pressure of regional metamorphism.

It is not strong enough to serve well as a crushed stone. Also alignment of mica grains gives a reflective sheen on phyllite. Among foliated metamorphic rocks, it represents a gradation in the degree of metamorphism between slate and schist. Phyllite is mainly composed of fine grains of mica minerals that are muscovite, or sericite. Slabs of phyllite are Both slate and phyllite form in
These larger crystals are known as porphyroblasts. Continued sedimentary basins that are deeply buried, or in accretionary wedges above [4], Mottana, Annibale, Rodolfo Crespi and Giuseppe Liborio (1978), https://en.wikipedia.org/w/index.php?title=Phyllite&oldid=983419591, Articles with unsourced statements from March 2013, Creative Commons Attribution-ShareAlike License, This page was last edited on 14 October 2020, at 03:37. Cite this article as: Geology Science. Phyllite It is composed mainly of flake-shaped mica minerals in parallel alignment. subjected to moderate heat and compression by the colliding of continental boundary, Hardness: 1-2 on the Mohs Hardness, Also fissility (a tendency to split into The term (from the Greek phyllos, leaf, a reference to its characteristic cleavage) was first used by C. F. Naumann … Phyllite is lustrous The strong parallel alignment of the mica grains allows the rock to be easily split into sheets or slabs. [citation needed], The minute crystals of graphite,[3] sericite, or chlorite, or the translucent fine-grained white mica,[1] impart a silky,[1] sometimes golden[citation needed] sheen to the surfaces of cleavage, called "phyllitic luster". metamorphism converts clay minerals into large grains of mica, along with