(See related pages)
Below you will find key words and concepts that you should remember from this chapter.
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| compressive stress | A stress due to a force pushing together on a body. (See page(s) 156) |
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| confining pressure | Pressure applied equally on all surfaces of a body; also called geostatic or lithostatic pressure. (See page(s) 155) |
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| contact metamorphism | Metamorphism under conditions in which high temperature is the dominant factor. (See page(s) 159) |
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| differential stress | When pressures on a body are not of equal strength in all directions. (See page(s) 156) |
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| ductile (plastic) | Capable of being molded and bent under stress. (See page(s) 154) |
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| foliation | Parallel alignment of textural and structural features of a rock. (See page(s) 157) |
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| gneiss | A metamorphic rock composed of light and dark layers or lenses. (See page(s) 162) |
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| gneissic | The texture of a metamorphic rock in which minerals are separated into light and dark layers or lenses. (See page(s) 158) |
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| hornfels | A fine-grained, unfoliated metamorphic rock. (See page(s) 159) |
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| hydrothermal rock | Rock deposited by precipitation of ions from solution in hot water. (See page(s) 167) |
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| isotherm | A line along which the temperature of rock (or other material) is the same. (See page(s) 165) |
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| marble | A coarse-grained rock composed of interlocking calcite (or dolomite) crystals. (See page(s) 160) |
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| metamorphic facies | Metamorphic rocks that contain the same set of pressure or temperature sensitive minerals are regarded as belonging to the same facies, implying that they formed under broadly similar pressure and temperature conditions. (See page(s) 166) |
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| metamorphic rock | A rock produced by metamorphism. (See page(s) 154) |
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| metamorphism | The transformation of preexisting rock into texturally or mineralogically distinct new rock as a result of high temperature, high pressure, or both, but without the rock melting in the process. (See page(s) 154) |
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| metasomatism | Metamorphism coupled with the introduction of ions from an external source. (See page(s) 168) |
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| migmatite | Mixed igneous and metamorphic rock. (See page(s) 164) |
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| parent rock | Original rock before being metamorphosed. (See page(s) 154) |
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| phyllite | A metamorphic rock in which clay minerals have recrystallized into microscopic micas, giving the rock a silky sheen. (See page(s) 162) |
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| quartzite | A rock composed of sand-sized grains of quartz that have been welded together during metamorphism. (See page(s) 160) |
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| regional metamorphism | Metamorphism that takes place at considerable depth underground. (See page(s) 160) |
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| schist | A metamorphic rock characterized by coarse-grained minerals oriented approximately parallel. (See page(s) 162) |
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| schistose | The texture of a rock in which visible platy or needle-shaped minerals have grown essentially parallel to each other under the influence of directed pressure. (See page(s) 157) |
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| shearing | Movement in which parts of a body slide relative to one another and parallel to the forces being exerted. (See page(s) 156) |
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| slate | A fine-grained rock that splits easily along flat, parallel planes. (See page(s) 162) |
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| slaty | Describing a rock that splits easily along nearly flat and parallel planes. (See page(s) 157) |
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| slaty cleavage | The ability of a rock to break along closely spaced parallel planes. (See page(s) 157) |
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| stress | A force acting on a body, or rock unit, that tends to change the size or shape of that body, or rock unit. Force per unit area within a body. (See page(s) 156) |
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| vein | Fracture in rock usually filled with late stage magmatic minerals and often containing metal ore. (See page(s) 167) |