Layered Gneiss

Type	Metamorphic Rock
Texture	Foliated; Medium- to coarse-grained
Composition	Quartz, Feldspar, Biotite, and Hornblende
Index Minerals
Color	Alternating bands of white and black
Miscellaneous	Layered or banded appearance
Metamorphic Type	Regional
Metamorphic Grade	High Grade (High P – High T)
Parent Rock	Shale, Mudstone, or Felsic Igneous rocks
Metamorphic Environment	High grade regional metamorphism along a convergent plate boundary