Examples of this type of rock include schist, marble, and gneiss.
Index minerals found in this material are sillimanite, kyanite, and andalusite. The discovery of an unusual form of this type of material embedded in the Kokchetav (cok-SHET-av) massif of Kazakhstan as well as several coesite belts in Europe provided evidence for UHP production of this material. Francis John Turner refined Pentti Eskola's theories about the different facies of this specific material, which may be produced in Barrovian (buh-ROVE-ee-an) zones and along the edge of (*) plutons. During the creation of this material, the protolith cannot melt into liquid magma, because that is a solid-state change instead. Reaching over 200 degrees Celsius and 1500 bars of pressure causes a protolith to become one of these. Examples of this type of rock include schist, marble, and gneiss. For 10 points, name this type of rock that arises from transformation of existing sedimentary or igneous rock.
Index minerals found in this material are sillimanite, kyanite, and andalusite.
metamorphic rock [prompt on "rock" until "type of rock"]