Andesite - Wikipedia Andesite is an aphanitic (fine-grained) to porphyritic (coarse-grained) igneous rock that is intermediate in its content of silica and low in alkali metals It has less than 20% quartz and 10% feldspathoid by volume, with at least 65% of the feldspar in the rock consisting of plagioclase
Andesite: Igneous Rock - Pictures, Definition More What is Andesite? Andesite is the name of a family of fine-grained, extrusive igneous rocks that are usually light to dark gray in color They have a mineral composition that is intermediate between granite and basalt Andesite is a rock typically found in volcanoes above convergent plate boundaries between continental and oceanic plates
Andesite | Properties, Composition, Formation, Uses Andesite is volcanic rock named after the Andes Mountains Intermediate in silica content, it is usually gray in color and may be fine-grained or porphyritic Andesite is the volcanic equivalent of diorite
Everything You Ought to Know about Andesite Rock - Geology Base Andesite is a durable, hard rock with a Mohs hardness of 6-7 and high compressive strength, making it ideal for various uses Some uses of andesite rocks include building stones, making aggregate, sculptures, and other decorative or ornamental accessories
Andesite | Volcanic, Igneous, Magma | Britannica Andesite, any member of a large family of rocks that occur in most of the world’s volcanic areas Andesites occur mainly as surface deposits and, to a lesser extent, as dikes and small plugs
Andesite: Mineral information, data and localities. It was named by Buch in 1826 from the Andes Mountains, South America A dark-colored, fine-grained, mostly extrusive rock that is approximately the fine-grained equivalent of diorite
The Geology of Andesite: A Comprehensive Overview Andesite is a type of igneous rock that is typically found in subduction zones and is characterized by a fine-grained texture and a composition that is intermediate between basalt and rhyolite
USGS: Volcano Hazards Program Glossary - Andesite Andesite is a gray to black volcanic rock with between about 52 and 63 weight percent silica (SiO2) Andesites contain crystals composed primarily of plagioclase feldspar and one or more of the minerals pyroxene (clinopyroxene and orthopyroxene) and lesser amounts of hornblende