phyllite is a type of foliated metamorphic rock created from slate that is further metamorphosed so that very fine grained white

tectonics background clay cleavage closeup composed compression derived detail fine finegrained flakes foliated geology grained gray hill himalayas homogeneous material metamorphic metamorphism mountain original pattern peculiar planes rock rocky rough scenery sedimentary shale slate stone strong surface volcanic fault geological geotechnical india nature petrology quartz regional sandstone sediment layers type