ANDESITE

ANDESITE

Andesite is an extrusive igneous rock consisting primarily of plagioclase feldspars plus pyroxene and/or hornblende. Biotite, magnetite, quartz and sphene are common constituents.

Andesite has the equivalent composition to the plutonic igneous rock, diorite.

Andesite is named after the Andes mountain range. These rocks are found near the subduction zones of ocean tectonic plates, along continental margins.

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IGNEOUS: ANDESITE; ANORTHOSITE; BASALT; CARBONATITE; DACITE; DIORITE; DUNITE; GABBRO; GRANITE; KIMBERLITE; KOMATIITE; LAMPROPHYRES; MONZONITE; OBSIDIAN; PEGMATITE; PERIDOTITE; PUMICE; PYROXENITE; RHYOLITE; SCORIA; SYENITE
METAMORPHIC: GNEISS; MARBLE; QUARTZITE; PHYLLITE; SCHIST; SERPENTINITE; SLATE; SOAPSTONE
SEDIMENTARY: ANHYDRITE; BANDED IRON FORMATION; BRECCIA; CHALK; CHERT; CLAYSTONE; COAL; CONGLOMERATE; COQUINA; DOLOMITE; GEODES; GYPSUM; HALITE; LIMESTONE; MUDSTONE; PHOSPHORITE; SANDSTONE; SHALE; SILTSTONE; TILLITE
UNCONSOLIDATED SEDIMENTS: ALLUVIAL DEPOSITS; LAHARS; MORAINES; PEAT; SANDS; SOILS; TEPHRA; TILLS; ORES; MINING TALUS PILES
PRIMORDIAL: COMETS; ASTEROIDS; METEORITES; CHONDRITES; CHONDRULES; CAI's; PRESOLAR GRAINS; METEORIC MINERALS

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