Low-grade regional metamorphic rocks. Examples from Cornwall that show the first tectonic and metamorphic fabrics in metasediments, plus a variety of sedimentary and igneous rock types in outcrop and hand specimen.
Medium-grade regional metamorphic rocks including the Barrovian index minerals in metapelites and amphibolite-facies calcareous sediments and meta-igneous rocks from collisional metamorphic belts.
High-grade regional metamorphic rocks, including migmatites and granulites from both Phanerozoic orogenic belts and Precambrian metamorphic terrains.
High-pressure metamorphic rocks from subduction-zone environments, belonging to the blueschist and eclogite facies.
Dynamic metamorphism: rocks from environments such as large-scale ductile shear zones, where intense deformation is the dominant feature.
Thermal metamorphism. Rocks formed in environments where directed stresses are not important, such as the contact aureoles around igneous bodies. Assemblages usually formed at low pressure.
Rocks formed by a variety of processes that involve fluids, transfer of material in fluid, or crystallisation from silicate-bearing fluid or fluid-rich melt.
Ultrabasic metamorphic rocks that derive from the Earth's mantle, found in ophiolite sequences, orogenic peridotites, or as nodules in volcanic pipes.