Slate

Type	Metamorphic Rock
Texture	Foliated; Very fine-grained
Composition	Chlorite, Plagioclase, Quartz
Index Minerals
Color	Bluish-gray
Miscellaneous	Foliation surface is dull and planar; Slaty Cleavage
Metamorphic Type	Regional
Metamorphic Grade	Low Grade (Low P – Low T)
Parent Rock	Shale or Mudstone
Metamorphic Environment	Low grade regional metamorphism along a convergent plate boundary