- Basalt - Wikipedia
An aphanitic (fine-grained) igneous rock is classified as basalt when its QAPF fraction is composed of less than 10% feldspathoid and less than 20% quartz, and plagioclase makes up at least 65% of its feldspar content This places basalt in the basalt andesite field of the QAPF diagram
- Basalt – Formation, Properties, Characteristics Earth’s Most Common . . .
Basalt is the most abundant volcanic rock on Earth, covering more than 90% of the ocean floor and large continental regions shaped by ancient lava flows It forms when mafic magma, rich in iron and magnesium but low in silica, erupts from the mantle and cools rapidly at or near the surface
- Basalt | Definition, Properties, Facts | Britannica
Basalt, extrusive igneous (volcanic) rock that is low in silica content, dark in color, and comparatively rich in iron and magnesium Basalts may be broadly classified on a chemical and petrographic basis into two main groups: the tholeiitic and the alkali basalts
- Basalt: Composition, Properties, Types, Uses – Geology In
Basalt is defined as a fine-grained, dark-colored igneous rock composed mainly of plagioclase and pyroxene minerals, with or without olivine It is formed from the rapid cooling of basaltic lava exposed at or very near the surface of the Earth (extrusive or volcanic rock)
- Basalt - Michigan Technological University
Basalt is the most common composition of lava rocks that cool from magma, liquid rock that rises from the deep Earth at volcanoes Today basalt is forming at many active rifts, including Iceland, the East African Rift Valley, the Red Sea and the Rio Grande Valley of New Mexico and Colorado
- Basalt Rock | Composition, Textures and Geological Role
Basalt is a very common dark-colored volcanic rock composed of calcic plagioclase (usually labradorite), clinopyroxene (augite) and iron ore (titaniferous magnetite)
- USGS: Volcano Hazards Program Glossary - Basalt
Basalt is a hard, black volcanic rock with less than about 52 weight percent silica (SiO2) Because of basalt's low silica content, it has a low viscosity (resistance to flow) Therefore, basaltic lava can flow quickly and easily move >20 km from a vent
- Basalt - Rockhounding Wiki
Basalt is a dark-colored, fine-grained igneous rock that forms from the rapid cooling of mafic lava It is the most common extrusive rock on Earth, making up most of the ocean floor and many continental volcanic areas
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