Metamorphic Rocks
Metamorphic rocks are pre-existing rocks that have been changed by exposure to unusual temperatures and/or pressures. The pre-existing rocks, called protoliths, may be igneous, sedimentary or other metamorphic rocks. After metamorphosis, these new rocks typically contain distinctive new minerals, reoriented into characteristic patterns. Metamorphic rocks are very common in the Jacksonville area and throughout the entire Appalachian mountain chain, so a knowledge of these rocks is essential.
How do metamorphic rocks from:
Metamorphic rocks are formed by heat, pressure, or a combination of both. These conditions cause the minerals from which the rock is made to become unstable and be rearranged into more stable mineral formations. The heat and pressure comes from different sources.
Links:http://imnh.isu.edu/Exhibits/Online/RLO/GeoOutreach/index.php?r=rockinternal&s=metamorphicformation
http://www.youtube.com/watch?v=-MSK3n5uNvg&safety_mode=true&safe=active&persist_safety_mode=1
http://www.youtube.com/watch?v=-MSK3n5uNvg&safety_mode=true&safe=active&persist_safety_mode=1
4 types of Metamorphic rocks
slate: is a foliated metamorphic rock that is formed through the metamorphism of shale. It is a low grade metamorphic rock that splits into thin pieces.
marble:a non-foliated metamorphic rock that is produced from the metamorphism of limestone. It is composed primarily of calcium carbonate
Phyllite: is a foliated metamorphic rock that is made up mainly of very fine-grained mica. The surface of phyllite is typically lustrous and sometimes wrinkled. It is intermediate in grade between slate and schist.
schist: is metamorphic rock with well developed foliation. It often contains significant amounts of mica which allow the rock to split into thin pieces. It is a rock of intermediate metamorphic grade between phyllite and gneiss. The specimen shown above is a "chlorite schist" because it contains a significant amount of chlorite.
marble:a non-foliated metamorphic rock that is produced from the metamorphism of limestone. It is composed primarily of calcium carbonate
Phyllite: is a foliated metamorphic rock that is made up mainly of very fine-grained mica. The surface of phyllite is typically lustrous and sometimes wrinkled. It is intermediate in grade between slate and schist.
schist: is metamorphic rock with well developed foliation. It often contains significant amounts of mica which allow the rock to split into thin pieces. It is a rock of intermediate metamorphic grade between phyllite and gneiss. The specimen shown above is a "chlorite schist" because it contains a significant amount of chlorite.
Links:http://geology.com/rocks/metamorphic-rocks.shtml
http://www.rocksandminerals4u.com/metamorphic.html
http://www.rocksandminerals4u.com/metamorphic.html
Uses of metamorphic rocks
Uses of Metamorphic Rocks include blackboard,roofs,sidewalks,floors and Marble is a metamorphic rock that is used to make floor tiles, counter tops and it is carved into statues and was used extensively in the building of the Roman Colosseum and other historic buildings.
Slate is another metamorphic rock that is used in buildings for floor and roofing tiles, and it was once used for blackboards. Quartzite is used as a source of silica; other forms of metamorphic rocks are useful as building components, monuments, counter tops, and facings.
Slate is another metamorphic rock that is used in buildings for floor and roofing tiles, and it was once used for blackboards. Quartzite is used as a source of silica; other forms of metamorphic rocks are useful as building components, monuments, counter tops, and facings.
