Quartzite

Type	Metamorphic Rock
Texture	Non-foliated; Medium-grained
Composition	Quartz
Index Minerals
Color	White to off-white
Miscellaneous	Interlocking grains
Metamorphic Type	Regional or Contact
Metamorphic Grade	Variable
Parent Rock	Quartz Sandstone
Metamorphic Environment	Variable grade regional or contact metamorphism along a convergent plate boundary