Amphibolite

Type	Metamorphic Rock
Texture	Non-foliated to weakly-foliated; Medium-grained
Composition	Amphibole and Plagioclase
Index Minerals	Amphibole
Color	Black
Miscellaneous	Salt and pepper appearance
Metamorphic Type	Regional
Metamorphic Grade	Middle Grade (Middle P – Middle T)
Parent Rock	Basalt; Mafic igneous rocks
Metamorphic Environment	Middle grade regional metamorphism along a convergent plate boundary