Metamorphism

Formed by intense PRESSURE Example: Plate collision zone, where pressure exerted deforms the rocks. These rocks often look foliated

Formed by intense HEAT Example: Magma is rising from mantle, rocks surrounding it are being deformed by the intense heat. But not to a point where they melt– NO MELTING! Otherwise these rocks would be igneous rocks.

Change of minerals and/or alignment of minerals in pre-existing rocks (protolith) without melting of the protolith (into magma). High pressure and temp but not to the point of melting (that would form igneous rock)

Pressure high Temp low (cold, dense, hard oceanic plate, also cold relative to mantle around it)

Found: where P high and T low Ocean-cont have lower temp than cont-cont collision Color: Actually blue because of presence of mineral called gluacophane (INDEX MINERAL) Protolith: Basalt or gabbro (not eg limestone cuz that is mainly carbon, not enonugh silica) Fun fact: if found on surface it means the surface you are looking at ancient ocean floor that has been involved in subduction, then has now been lifted up/ (RARE)

Formed under: High P and T Contains: Garnet (red) Pyroxene (green) and sometimes diamonds Fun fact: Even more rare than blueschist facies because they are formed even deeper