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  1. protolithA fine-grained metamorphic rock with a foliation caused by the preferred orientation of very fine-grained mica.

          

  2. metamorphic mineralThe region between two metamorphic isograds, typically named after an index mineral found within the region.

          

  3. quartziteA metamorphic rock composed of quartz and transformed from a protolith of quartz sandstone.

          

  4. ExhumationLayering formed as a consequence of the alignment of mineral grains, or of compositional banding in a metamorphic rock.

          

  5. MetamorphismThe process by which one kind of rock transforms into a different kind of rock.

          

  6. slateA fine-grained metamorphic rock with a foliation caused by the preferred orientation of very fine-grained mica.

          

  7. metamorphic foliationA set of metamorphic mineral assemblages indicative of metamorphism under a specific range of pressures and temperatures.

          

  8. preferred mineral orientationThe metamorphic texture that exists where platy grains lie parallel to one another and/or elongate grains align in the same direction.

          

  9. GneissA medium- to coarse-grained metamorphic rock that possesses schistosity.

          

  10. foliationLayering formed as a consequence of the alignment of mineral grains, or of compositional banding in a metamorphic rock.

          

  11. metaconglomerateAn informal designation of the degree to which a rock has undergone metamorphism; high-grade rocks have endured higher temperatures than low-grade rocks.

          

  12. thermal metamorphismMetamorphism due to the increase in temperature and pressure in a rock when it has been buried to a depth of several kilometers.

          

  13. metamorphic aureoleRock that forms when preexisting rock changes into new rock as a result of an increase in pressure and temperature and/or shearing under elevated temperatures; metamorphism occurs without the rock first becoming a melt or a sediment.

          

  14. dynamic metamorphismMetamorphism caused by heat conducted into country rock from an igneous intrusion.

          

  15. metamorphic rockRock that forms when preexisting rock changes into new rock as a result of an increase in pressure and temperature and/or shearing under elevated temperatures; metamorphism occurs without the rock first becoming a melt or a sediment.

          

  16. shieldA medium- to coarse-grained metamorphic rock that possesses schistosity.

          

  17. regional metamorphismMetamorphism of a broad region, usually the result of deep burial during an orogeny.

          

  18. metamorphic zoneThe region between two metamorphic isograds, typically named after an index mineral found within the region.

          

  19. MarbleFine-grained, low-grade metamorphic rock, formed by the metamorphism of shale.

          

  20. burial metamorphismMetamorphism due to the increase in temperature and pressure in a rock when it has been buried to a depth of several kilometers.

          

  21. MetasomatismThe process by which a rocks overall chemical composition changes during metamorphism because of reactions with hot water that bring in or remove elements.

          

  22. schistAn older, interior region of a continent.

          

  23. shock metamorphismSolid-state changes in rock that result from the extreme pressure accompanying a meteorite impact.

          

  24. metamorphic textureThe arrangement of grains (e.g., preferred orientation) formed as a result of metamorphism.

          

  25. HornfelsA metamorphic rock composed of calcite and transformed from a protolith of limestone.

          

  26. differential stressA condition causing a material to experience a push or pull in one direction of a greater magnitude than the push or pull in another direction; in some cases, differential stress can result in shearing.

          

  27. Dynamothermal metamorphismThe change that occurs in a rock due to interaction with high-temperature water solutions.

          

  28. phylliteFine-grained, low-grade metamorphic rock, formed by the metamorphism of shale.

          

  29. metamorphic gradeAn informal designation of the degree to which a rock has undergone metamorphism; high-grade rocks have endured higher temperatures than low-grade rocks.

          

  30. hydrothermal metamorphismThe change that occurs in a rock due to interaction with high-temperature water solutions.

          

  31. contact metamorphismMetamorphism caused by heat conducted into country rock from an igneous intrusion.

          

  32. metamorphic faciesA set of metamorphic mineral assemblages indicative of metamorphism under a specific range of pressures and temperatures.