 Heat and or extreme pressure  Original rock is the parent rock Can be sedimentary, igneous, or metamorphic  The heat is not enough to melt the parent rock  Recrystallization Heat and/or pressure can cause the bonds in the minerals atoms to break They join together differently to form new minerals

 The way most metamorphic change occurs  Usually the deeper down the rocks are the more change that occurs  Usually due to both heat and pressure  Mountain ranges are examples of large area metamorphism

 Caused by heat or pressure but not both  Magma comes near rocks but doesn’t melt them The heat causes recrystallization to occur  An earthquake causes rocks to grind past each other The pressure causes recrystallization to occur

 These rocks have flat or wavy parallel bands  Usually produced by large area metamorphism  The minerals flatten out or line up in bands

 If a rock only has one type of mineral there will be no foliation  They will not split into layers  Can be formed by heat alone

 Foliated  Parent rock is shale  Changed by Heat and Pressure  Mica starts to grow as recrystallization begins  Used in roofing, flooring, and landscaping

Foliated Parent Rock is Slate Associated with regional metamorphism and mountain building Tends to split easily

 Foliated  Parent rock is Phylite  Contains large amounts of mica Allows it to split into thin pieces

 Foliated  Parent rock is Schist  Formed deep within the crust Temperatures between C  Usually does not break along layers

 Nonfoliated  Parent rock is Limestone  Made mostly of one mineral Calcium Carbonate (Calcite)  Used for tile, countertops, sculptures