Phyllite has fine-grained mica flakes, whereas slate has extremely fine mica flakes, and schist has large mica flakes, all mica flakes of which have achieved a preferred orientation.[1] Among foliated metamorphic rocks, it represents a gradation in the degree of metamorphism between slate and schist.[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".[1]
The word comes from the Greek phyllon, meaning "leaf".[1]
The protolith (or parent rock) for phyllite is shale or pelite; or slate, which in turn came from a shale protolith. Its constituent platy minerals are larger than those in slate but are not visible with the naked eye. Phyllites are said to have a texture called "phyllitic sheen," and are usually classified as having formed through low-grade metamorphic conditions through regional metamorphism metamorphic facies.
Phyllite has good fissility (a tendency to split into sheets). Phyllites are usually black to gray or light greenish gray in color. The foliation is commonly crinkled or wavy in appearance. Phyllites are mostly used in decorative aggregates, interior decors, building stones, facing stones, garden decoration and curbing. Cemetery markers, commemorative tablets, creating artworks and writing slates are some of its commercial uses.
Phyllite is commonly found in the Dalradian metasediments of northwest Arran. In north Cornwall, there are Tredorn phyllites and Woolgarden phyllites.[4][self-published source?]
Carolina "slate" is often volcanic phyllite. A type of Carolina slate, Duke stone, is a dacitic phyllite that is fractured and colored with iron oxide.
Referencesedit
^ abcdefStephen Marshak Essentials of Geology, 3rd ed.
^Mottana, Annibale, Rodolfo Crespi and Giuseppe Liborio (1978) Simon & Schuster's Guide to Rocks and Minerals. New York: Simon & Schuster Inc.
^Schumann, Walter, (1993) Handbook of Rocks, Minerals, & Gemstones. Boston & New York: Houghton Mifflin Company.
^Barton, R. M. (1964) An Introduction to the Geology of Cornwall. Truro: D. Bradford Barton; p. 89
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phyllite, type, foliated, metamorphic, rock, formed, from, slate, that, further, metamorphosed, that, very, fine, grained, white, mica, achieves, preferred, orientation, primarily, composed, quartz, sericite, mica, chlorite, photomicrograph, thin, section, phy. Phyllite ˈ f ɪ l aɪ t FIL yte is a type of foliated metamorphic rock formed from slate that is further metamorphosed so that very fine grained white mica achieves a preferred orientation 1 It is primarily composed of quartz sericite mica and chlorite 2 PhyllitePhotomicrograph of thin section of phyllite in cross polarised light Fractured Duke stone showing phyllitic texturePhyllitePhyllite has fine grained mica flakes whereas slate has extremely fine mica flakes and schist has large mica flakes all mica flakes of which have achieved a preferred orientation 1 Among foliated metamorphic rocks it represents a gradation in the degree of metamorphism between slate and schist 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 1 The word comes from the Greek phyllon meaning leaf 1 The protolith or parent rock for phyllite is shale or pelite or slate which in turn came from a shale protolith Its constituent platy minerals are larger than those in slate but are not visible with the naked eye Phyllites are said to have a texture called phyllitic sheen and are usually classified as having formed through low grade metamorphic conditions through regional metamorphism metamorphic facies Phyllite has good fissility a tendency to split into sheets Phyllites are usually black to gray or light greenish gray in color The foliation is commonly crinkled or wavy in appearance Phyllites are mostly used in decorative aggregates interior decors building stones facing stones garden decoration and curbing Cemetery markers commemorative tablets creating artworks and writing slates are some of its commercial uses Phyllite is commonly found in the Dalradian metasediments of northwest Arran In north Cornwall there are Tredorn phyllites and Woolgarden phyllites 4 self published source Carolina slate is often volcanic phyllite A type of Carolina slate Duke stone is a dacitic phyllite that is fractured and colored with iron oxide References edit a b c d e f Stephen Marshak Essentials of Geology 3rd ed Mottana Annibale Rodolfo Crespi and Giuseppe Liborio 1978 Simon amp Schuster s Guide to Rocks and Minerals New York Simon amp Schuster Inc Schumann Walter 1993 Handbook of Rocks Minerals amp Gemstones Boston amp New York Houghton Mifflin Company Barton R M 1964 An Introduction to the Geology of Cornwall Truro D Bradford Barton p 89External links edit nbsp Look up phyllite in Wiktionary the free dictionary nbsp Wikimedia Commons has media related to Phyllite nbsp This metamorphic rock related article is a stub You can help Wikipedia by expanding it vte Retrieved from https en wikipedia org w index php title Phyllite amp oldid 1207743629, wikipedia, wiki, book, books, library,
