The dark, aphanitic, extrusive rock that has a silica content of about 60% and is the second most abundant volcanic rock Andesites are found in large quantities in the Andes Mountains
Fine-grained, medium gray volcanic rock of intermediate composition between rhyolite and basalt
A fine-grained, mafic volcanic rock consisting of both mafic minerals and plagioclase, and also usually containing quartz
A medium-colored dark gray volcanic rock containing 53-63 percent silica with a moderate viscosity when in a molten state Intermediate in color, composition, and eruptive character between basalt and dacite
Igneous volcanic rock, less mafic than basalt, but more mafic than dacite; rough volcanic equivalent of diorite
A volcanic rock containing 53-63% silica with a moderate viscosity when in a molten state
Grey to black, dense, hard, volcanic rock in its unaltered state Contains 52-63% silica Found around the Pacific Rim, and named after the Andes Mountain Range At Waihi this rock hosts the quartz that contains the precious metal deposits
-Fine-grained volcanic rock composed of andesine (plagioclase) with one or more mafic constituents
A type of volcanic rock consisting of feldspar and other silicate minerals rich in iron and magnesium with an intermediate silica content of about 60 percent Andesite lava flows form some of the most beautiful stratified volcanoes in the world An example is Mount Fuji in Japan
A dark coloured extrusive igneous rock composed of sodic plagioclase minerals (e g andesine), and mafic minerals that may include biotite, hornblende or pyroxene Phenocrysts are often common and may comprise one or more of these minerals Quartz is also often present in the matrix or 'groundmass'
Volcanic rock (or lava) characteristically medium dark in color and containing 54 to 62 percent silica and moderate amounts of iron and magnesium
An eruptive rock allied to trachyte, consisting essentially of a triclinic feldspar, with pyroxene, hornblende, or hypersthene
Any member of a large family of rocks that occur in most of the world's volcanic areas, mainly as surface deposits and to a lesser extent as dikes and small plugs. The Andes, where the name was first applied, and most of the cordillera (parallel mountain chains) of Central and North America consist largely of andesites. They also occur in abundance in volcanoes along practically the entire margin of the Pacific basin. Andesites are most often porphyritic (having distinct crystals in a fine-grained base) rocks
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