Phyllite is a type of foliated metamorphic rock primarily composed of quartz, sericite mica, and chlorite; the rock represents a gradiation in the degree of metamorphism between slate and mica schist. Minute crystals of graphite, sericite, or chlorite impart a silky, sometimes golden sheen to the surfaces of cleavage (or schistosity).

The protolith (or parent rock) for a phyllite is a slate. Its constituent platy minerals are larger than those in slate but are not visible with the naked eye. Phyllites are said to have a "phyllitic texture" and are usually classified as having a low grade in the regional metamorphic facies.

Phyllite has a good fissility (a tendency to split into sheets) and will form under low grade metamorphic conditions. Phyllites are usually black or gray. The foliation is commonly crinkled or wavy in appearance.

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  • Phyllite — Phyllite, dünn bis dickschieferige, feinkristalline oder dichte Schichtgesteine, die im äußeren Ansehen, im Korn und in der Zusammensetzung entweder dem Tonschiefer oder einem feinkörnigen Glimmerschiefer ähneln. Ihrer Gesteinsnatur nach stehen… …   Lexikon der gesamten Technik

  • Phyllite — La phyllite est un type de roche métamorphique foliée composée à l origine de quartz, de micas à base de séricite et de chlorite. Le degré de métamorphisme de la roche se situe entre celui de l ardoise et celui des micaschistes …   Wikipédia en Français

  • Phyllite — Phyl lite, n. [See {Phylo }.] (Min.) (a) A mineral related to ottrelite. (b) Clay slate; argillaceous schist. [1913 Webster] …   The Collaborative International Dictionary of English

  • phyllite — ● phyllite nom féminin Argile compacte finement feuilletée, variété de phyllosilicate …   Encyclopédie Universelle

  • phyllite — [fil′īt΄] n. a type of metamorphic rock having tiny mica grains that give it a luster: it is intermediate in crystal development between slate and schist …   English World dictionary

  • phyllite — phyllitic /fi lit ik/, adj. /fil uyt/, n. a slaty rock, the cleavage planes of which have a luster imparted by minute scales of mica. [1820 30; PHYLL + ITE1] * * * Fine grained metamorphic rock formed by the recrystallization of fine grained,… …   Universalium

  • phyllite — filitas statusas T sritis chemija apibrėžtis Masyvi, tamsi, šilkinio blizgesio skalūnuota uoliena iš kvarco, sericito, kartais turinti nedidelį kiekį chlorito, biotito ir albito. atitikmenys: angl. phyllite rus. филлит …   Chemijos terminų aiškinamasis žodynas

  • phyllite — noun a type of metamorphic rock formed from clay rich sediments called pelites …   Wiktionary

  • phyllite — [ fɪlʌɪt] noun Geology a fine grained metamorphic rock with a well developed laminar structure, intermediate between slate and schist. Origin C19: from Gk phullon leaf + ite1 …   English new terms dictionary

  • phyllite — phyl·lite …   English syllables

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