Type Metamorphic Rock
Texture Non-foliated to weakly-foliated; Fine-grained
Composition Epidote and Chlorite
Index Minerals Epidote and Chlorite
Color Green
Miscellaneous Harder than glass
Metamorphic Type Regional
Metamorphic Grade Low Grade (Low P – Low T)
Parent Rock Basalt; Mafic igneous rocks
Metamorphic Environment Low grade regional metamorphism along a convergent plate boundary