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Igneous Rocks | Pictures of Intrusive and Extrusive Rock Types Intrusive igneous rocks crystallize below Earth's surface, and the slow cooling that occurs there allows large crystals to form Examples of intrusive igneous rocks are: diabase, diorite, gabbro, granite, pegmatite, and peridotite
Geology and Earth Science News, Articles, Photos, Maps and More Geology com is one of the world's leading portals to geology and Earth science news and information for rocks, minerals, gemstones, energy, volcanoes, earthquakes, careers, geologic hazards, and more
Gypsum Mineral | Uses and Properties - Geology. com Inexpensive mineral collections are available in the Geology com Store Image copyright iStockphoto Anna Usova Selenite Gypsum: Selenite, a variety of gypsum from Penfield, New York Specimen is approximately 2-1 2 inches (6 4 centimeters) across Gypsum from Virginia: Gypsum from North Holston, Virginia
Granite: Igneous Rock - Pictures, Definition More - Geology. com Granite is the most widely known igneous rock It is an intrusive rock with visible grains of feldspar, quartz, mica, and amphibole minerals It is durable and widely used in construction and architecture
Marble: Metamorphic Rock: Pictures, Definition, Properties Marble is a metamorphic rock that forms when limestone is subjected to the heat and pressure of metamorphism It is composed primarily of the mineral calcite (CaCO 3) and usually contains other minerals, such as clay minerals, micas, quartz, pyrite, iron oxides, and graphite
Basalt: Igneous Rock - Pictures, Definition, Uses More Basalt is a dark-colored, fine-grained, igneous rock composed mainly of plagioclase and pyroxene minerals It most commonly forms as an extrusive rock, such as a lava flow, but can also form in small intrusive bodies, such as an igneous dike or a thin sill
Sedimentary Rocks | Pictures, Characteristics, Textures, Types What Are Sedimentary Rocks? Sedimentary rocks are formed by the accumulation of sediments There are three basic types of sedimentary rocks Clastic sedimentary rocks form from the accumulation and lithification of mechanical weathering debris Examples include: breccia, conglomerate, sandstone, siltstone, and shale
Amphibolite: Metamorphic Rock - Pictures, Definition More Amphibolite is a rock of convergent plate boundaries where heat and pressure cause regional metamorphism It can be produced through the metamorphism of mafic igneous rocks such as basalt and gabbro, or from the metamorphism of clay-rich sedimentary rocks such as marl or graywacke
Obsidian: Igneous Rock - Pictures, Uses, Properties - Geology. com Obsidian is an igneous rock that forms when molten rock material cools so rapidly that atoms are unable to arrange themselves into a crystalline structure It is an amorphous material known as a " mineraloid "