Simple Lithology

phyllite

http://resource.geosciml.org/classifier/cgi/lithology/phyllite

definition Rock with a well developed, continuous schistosity, an average grain size between 0.1 and 0.5 millimeters, and a silvery sheen on cleavage surfaces. Individual phyllosilicate grains are barely visible with the unaided eye. more like this
source IUGS SCMR 2007 (http://www.bgs.ac.uk/SCMR/) more like this
type
Resource
Concept
broader foliated metamorphic rock
narrower phyllite
in scheme simplelithology
is primary topic of phyllite