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Phyllite |
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phylliteFine-grained metamorphic rock formed by the recrystallization of fine-grained, parent sedimentary rocks, such as mudstones or shales. Phyllite has a marked tendency to split into sheets or slabs; it may have a sheen on its surfaces due to tiny plates of micas. Its grain size is larger than that of slate but smaller than that of schist. phyllite [′fi‚līt] (petrology) A metamorphic rock intermediate in grade between slate and schist, and derived from argillaceous sediments; has a silky sheen on the cleavage surface. Phyllite a metamorphic rock that consists mainly of minute flakes of sericite or chlorite and is characterized by a fine schistosity. Phyllite also contains grains of detrital quartz and sometimes contains protogenous albite crystals. Phyllite is usually dark gray or black. It is formed during low-grade regional metamorphism of predominantly argillaceous sediments and is intermediate in metamorphic grade between clay slate and mica schist. (See alsoSLANTSY.) How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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