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Basalt - Wikipedia Basalt is also an important rock type on other planetary bodies in the Solar System For example, the bulk of the plains of Venus, which cover ~80% of the surface, are basaltic; the lunar maria are plains of flood-basaltic lava flows; and basalt is a common rock on the surface of Mars
Basalt | Definition, Properties, Facts | Britannica basalt, extrusive igneous (volcanic) rock that is low in silica content, dark in colour, and comparatively rich in iron and magnesium Some basalts are quite glassy (tachylytes), and many are very fine-grained and compact
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 – Formation, Properties, Characteristics Earth’s . . . 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
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
BASALTIC Definition Meaning - Merriam-Webster The meaning of BASALT is a dark gray to black dense to fine-grained igneous rock that consists of basic plagioclase, augite, and usually magnetite