Types of Rocks
Igneous rocks are formed from the solidification of molten rock material. There are two types of Igneous rocks:
1) Intrusive igneous rocks such as diorite, gabbro, granite and pegmatite that solidify below Earth’s surface.
2) Extrusive igneous rocks such as andesite, basalt, obsidian, pumice, rhyolite and scoria that solidify on or above Earth’s surface.
Granite, shown below, is an example of Igneous rock.
Sedimentary rocks are formed by the accumulation of sediments. There are three basic types of sedimentary rocks:
1) clastic sedimentary rocks such as breccia, conglomerate, sandstone and shale, that are formed from mechanical weathering debris.
2) chemical sedimentary rocks such as rock salt and some limestones, that form when dissolved materials precipitate from solution.
3) organic sedimentary rocks such as coal and some limestones which form from the accumulation of plant or animal debris.
Limestone, shown below, is an example of Sedimentary rock.
Metamorphic rocks have been modified by heat, pressure and chemical process usually while buried deep below Earth’s surface. Exposure to these extreme conditions has altered the mineralogy, texture and chemical composition of the rocks. There are two basic types of metamorphic rocks:
1) Foliated metamorphic rocks such as gneiss, phyllite, schist and slate which have a layered or banded appearance that is produced by exposure to heat and directed pressure.
2) Non-foliated metamorphic rocks such as marble and quartzite which do not have a layered or banded appearance.
Marble, shown below, is an example of Metamorphic rock.
Photos courtesy of geology.com. Types of Rocks.
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