(*) Schistosity [shis-TOSS-it-ee] is one way that these materials can exhibit their characteristic property of foliation.
Pentti Eskola assigned this material to different facies [fay-sheez] based on its position on phase diagrams. Pseudotachylite is a type of this material that forms after a shock. Chlorite, staurolite, and andalusite are three types of index materials used to determine the stage of formation of this material, one variety of which is hornfels. Generically, this kind of material forms out of protolith. (*) Schistosity [shis-TOSS-it-ee] is one way that these materials can exhibit their characteristic property of foliation. Gneiss ["nice"] is an example of this kind of rock, which forms from "contact" and "regional" forms of a certain process through either proximity to plutons or large scale high pressure and temperature. For 10 points, name this third type of rock along with igneous and sedimentary, which is named for the Greek for "change."
Pentti Eskola assigned this material to different facies [fay-sheez] based on its position on phase diagrams.
metamorphic rock [do NOT accept or prompt on “metamorphism” or “metamorphosis” since those are not materials] &lt;JL, EarthSci&gt;