There are a limited number of common metamorphic rock types:
|ROCK NAME||TYPE||PARENT ROCK||CHARACTERISTICS|
|SLATE||foliated||shales and muds||prominant splitting surfaces|
|SCHIST||foliated||fine grained rocks||mica minerals, often crinkled or wavy|
|GNEISS||foliated||coarse grained rocks||dark and light bands or layers of aligned minerals|
|QUARTZITE||non-foliated||sandstone||interlocking almost fused quartz grains, little or no porosity|
|MARBLE||non-foliated||limestone||interlocking, often coarse, calcite crystals, little or no porosity|
Contact metamorphic rocks are recrystallized and rarely show foliation. Shales baked by igneous contact form very hard fine-grained rocks called HORNFELS. Calcareous rocks (dirty limestones) when subject to contact metamorphism an alteration by hot fluids produce rocks called SKARNS.