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Phyllite

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phyllite

Fine-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.)
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The police action, codenamed Operation Phyllite, focused on sites based all over the world, including eastern Europe, Russia and the United States.
Police pull plug on football ticket websites in swoop by The Journal (Newcastle, England)
The Hardscrabble Mountain consists of black phyllite and siltite with volcanic and limestone intervals.
Great Mining Camps of Canada 3. The History and Geology of the ... by Brown, Atholl Sutherland; Ash, Chris H. / Geoscience Canada
Two grave goods were discovered: a blackish-green Karlova-type battle-axe of diorite, which lay by his right hand, and a phyllite arrowhead (arrow as a grave good?
New AMS dates from Estonian Stone Age burial sites/UUED ... by Kriiska, Aivar; Lougas, Lembi; Lohmus, Mari; Mannermaa, Kristiina; Johanson, Kristiina / Estonian Journal of Archaeology
 
 
 
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