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A large intrusion will contain more thermal energy and will cool much more slowly than a small one, and therefore will provide a longer time and more heat for metamorphism. It is about two inches (five centimeters) across. Similarly, a gneiss that originated as basalt and is dominated by amphibole, is an amphibole gneiss or, more accurately, an amphibolite. What are some of the differences between foliated rocks and nonfoliated rocks? Reviewed by: Sylvie Tremblay, M.Sc. Block-in-matrix structures are observed in these exposures, including a large metaconglomerate block (10s m in diameter) found at . A special type of metamorphism takes place under these very high-pressure but relatively low-temperature conditions, producing an amphibole mineral known as glaucophane (Na2(Mg3Al2)Si8O22(OH)2). Specific patterns of foliation depend on the types of minerals found in the original rock, the size of the mineral grains and the way pressure is applied to the rock during metamorphosis. The best way to learn about rocks is to have a collection of specimens to examine while you study. A rock that is dominated by aligned crystals of amphibole. If you have never seen or even heard of blueschist, that not surprising. Figure 10.24 Metaconglomerate formed through burial metamorphism. Granofels is a broad term for medium- to coarse-grained metamorphic rocks that do not exhibit any specific foliation. It often forms when carbonate rocks near a magma body are altered by contact metamorphism and metasomatism. Metamorphic Rocks | Pictures of Foliated and Non-Foliated Types - Geology If the hornfels formed in a situation without directed pressure, then these minerals would be randomly orientated, not foliated as they would be if formed with directed pressure. Drag the appropriate labels to their respective targets. Preface to the First University of Saskatchewan Edition, Second University of Saskatchewan Edition: Goals, 1.4 We Study Earth Using the Scientific Method, 1.5 Three Big Ideas: Geological Time, Uniformitarianism, and Plate Tectonics, 2.2 Forming Planets from the Remnants of Exploded Stars, 3.1 Earth's Layers: Crust, Mantle, and Core, 4.1 Alfred Wegener's Arguments for Plate Tectonics, 4.2 Global Geological Models of the Early 20th Century, 4.3 Geological Renaissance of the Mid-20th Century, 4.4 Plates, Plate Motions, and Plate-Boundary Processes, 8.3 Controls on Weathering Processes and Rates, 8.4 Weathering and Erosion Produce Sediments, 9.2 Chemical and Biochemical Sedimentary Rocks, 9.4 Depositional Environments and Sedimentary Basins, 10.4 Types of Metamorphism and Where They Occur, 10.5 Metamorphic Facies and Index Minerals, 10.6 Metamorphic Hydrothermal Processes and Metasomatism, 11.2 Materials Produced by Volcanic Eruptions, 11.7 Monitoring Volcanoes and Predicting Eruptions, 12.5 Forecasting Earthquakes and Minimizing Impacts, 15.1 Factors That Control Slope Stability, 15.3 Preventing, Delaying, Monitoring, and Mitigating Mass Wasting, 18.1 If You Can't Grow It, You Have to Mine It, Appendix A. If the original limestone was pure calcite, then the marble will likely be white (as in Figure 7.10), but if it had various impurities, such as clay, silica, or magnesium, the marble could be marbled in appearance. Metamorphic Rock Specimens - Mineral [1], Foliated metaconglomerate is created under the same metamorphic conditions that produce slate or phyllite, but with the parent rock (protolith) being conglomerate, rather than clay.