Andesite is an extrusive igneous, volcanic rock, of intermediate composition, with aphanitic to porphyritic texture. source
Andesite is an extrusive igneous, volcanic rock, of intermediate composition, with aphanitic to porphyritic texture.
Andesite is the intermediate type between basalt and dacite. source
Andesite is the intermediate type between basalt and dacite.
Andesite ranges from 57 to 63% silicon dioxide (SiO2) as illustrated in TAS diagrams. source
Andesite ranges from 57 to 63% silicon dioxide (SiO2) as illustrated in TAS diagrams.
The quartz-feldspar abundances in andesite and other volcanic rocks are illustrated in QAPF diagrams. source
The quartz-feldspar abundances in andesite and other volcanic rocks are illustrated in QAPF diagrams.
Classification of andesites may be refined according to the most abundant phenocryst. source
Classification of andesites may be refined according to the most abundant phenocryst.
Andesite can be considered as the extrusive equivalent of plutonic diorite. source
Andesite can be considered as the extrusive equivalent of plutonic diorite.
Characteristic of subduction zones, andesite represents the dominant rock type in island arcs. source
Characteristic of subduction zones, andesite represents the dominant rock type in island arcs.
The name andesite is derived from the Andes mountain range. source
The name andesite is derived from the Andes mountain range.
To achieve andesitic composition via fractional crystallization, a basaltic magma must crystallize specific minerals that are then removed from the melt. source
To achieve andesitic composition via fractional crystallization, a basaltic magma must crystallize specific minerals that are then removed from the melt.
Andesitic magmas generated in island arcs, therefore, are probably the result of partial melting of the crust. source
Andesitic magmas generated in island arcs, therefore, are probably the result of partial melting of the crust.
In 2009, researchers revealed that andesite was found in two meteorites (numbered GRA 06128 and GRA 06129). source
In 2009, researchers revealed that andesite was found in two meteorites (numbered GRA 06128 and GRA 06129).
Andesite were discovered in the Graves Nunataks icefield during the US Antarctic Search for Meteorites 2006/2007 field season. source
Andesite were discovered in the Graves Nunataks icefield during the US Antarctic Search for Meteorites 2006/2007 field season.
Andesite is typically formed at convergent plate margins but may occur in other tectonic settings. source
Andesite is typically formed at convergent plate margins but may occur in other tectonic settings.
Andesite Mount Žarnov (Vtáčnik), Slovakia. source
Andesite Mount Žarnov (Vtáčnik), Slovakia.
A sample of andesite (dark groundmass) with amygdaloidal vesicules filled with zeolite. Diameter of view is 8 cm. source
A sample of andesite (dark groundmass) with amygdaloidal vesicules filled with zeolite. Diameter of view is 8 cm.
