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A green, gray, or red metamorphic rock, similar to slate but often having a wavy surface and a distinctive micaceous luster.

phyl·lit′ic (fĭ-lĭt′ĭk) adj.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


(Geological Science) a compact lustrous metamorphic rock, rich in mica, derived from a shale or other clay-rich rock
[C19: from phyll(o)- + -ite1]
phyllitic adj
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(ˈfɪl aɪt)

a slaty rock, the cleavage planes of which have a luster imparted by minute scales of mica.
[1820–30; < Greek phýll(on) leaf + -ite1]
phyl•lit•ic (fɪˈlɪt ɪk) adj.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
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These sedimentary deposits have undergone weak regional metamorphism which permitted the transformation of schist to seritoschists, chloritoschists, graphitic schists, sandy schists, and quartzites, to coarse grained conglomeratic quartzites, to quartzite of medium grained, fine-grained quartzites and to differentiate the phyllitic and siliceous facies.
The basement of the study area consists of Triassic phyllites, phyllitic schists and partially metamorphosed clastic rocks (metaarkose, metagraywacke) (Kahya and Kuscu, 2014)(Fig.
Slate and phyllite occur as low lying highly fissile rocks with diagnostic slaty and phyllitic cleavages, respectively.
The geology of the area consists of anatectite-bearing Greater Himalayan sequence phyllitic schist, paragneiss and orthogneiss that generally increases in metamorphic grade and anatectite content up structural section.
Martin [1] divided the metasedimentary rocks in three sections: a lower section (Mireles Phyllite) essentially phyllitic and fossiliferous metalimolite; an intermediate (Cerrajon Metapelite) with interlayering of sterile quartzite, exposed in the central and north central parts of the massif; and a top sterile (Canaote Quartzite), of medium to coarse grain quartzite, exposed in the southwestern parts.
Samples collected from the Garnet Hill locality contain idiomorphic garnet porphyroblasts up to two centimeters in diameter that have grown in a fine-grained phyllitic matrix.
The alliance occurs on non-calcareous substrates, such as granite, gneiss, and phyllitic schists, on serpentine, on hard and soft marls, on volcanic soils, and on sand.
By intervals, there are joints corresponding to a deposition of whitish, phyllitic (clays) or reddish (ferric oxides) minerals.
Some display crenulation cleavage; all have a phyllitic alignment of the platy minerals.
The two primary soil types of High Valley are weathered volcanic residue and Franciscan Complex weathered sandstone, shale or phyllitic rocks.
The oldest comprises siliciclastic rocks of the Vampire Formation (Neoproterozoic to Early Cambrian), which locally consists of a rusty-weathering phyllitic shale that is grey on fresh surface and, in places, calcareous.
The Paleozoic sediments have undergone very low-grade regional metamorphism with induration of the sandstone to quartzite, and the black shales are locally phyllitic with lenticular shear fractures and spaced cleavage.