Serpentinite

Type	Metamorphic Rock
Texture	Non-foliated to weakly-foliated; Variable grain size
Composition	Serpentine
Index Minerals
Color	Mottled Green and gray
Miscellaneous	May be harder than glass in places
Metamorphic Type	Hydrothermal
Metamorphic Grade	Low Grade
Parent Rock	Peridotite
Metamorphic Environment	Hydrothermal solutions concentrated during final stages of magma crystallization in batholiths or hot seawater solutions drawn down into subduction zones