Phyllite

Type	Metamorphic Rock
Texture	Foliated; Fine-grained
Composition	Muscovite, Biotite, Quartz, Plagioclase
Index Minerals
Color	Shiny Gray
Miscellaneous	Foliation surface has a satiny sheen and crinkled appearance
Metamorphic Type	Regional
Metamorphic Grade	Low Grade (Higher than Slate)
Parent Rock	Shale or Mudstone
Metamorphic Environment	Low grade regional metamorphism along a convergent plate boundary