{"thcode":4,"term":{"code":"5.12","name":"Skarn","parent":"5","scope":"A rock of complex mineralogic composition formed by contact metamorphism and metasomatism of carbonate rocks.  It is typically coarse-grained and rich in garnet, iron-rich pyroxene, epidote, wollastonite, and scapolite."},"uf":[],"bt":[{"code":"5","name":"Metamorphic rock","parent":"0","scope":"A rock derived from pre-existing rocks by mineralogical, chemical, and\/or structural changes, essentially in the solid state, in response to marked changes in temperature, pressure, shearing stress, and chemical environment, generally at depth in the earth's crust."},{"code":"0","name":"Earth material","parent":null,"scope":"Geologic map unit classification (Bruce R. Johnson) version 6.2: A hierarchical classification of earth materials for digital geologic maps."}],"nt":[],"rt":[]}