Andesite (igneous rock), Romania3D ModelNoAI
Locality: Romania
Size: 11 cm x 7 cm x 2 cm
Type: Igneous extrusive (volcanic) rock
Description: Aphanitic, microcrystalline to glassy, igneous rock whose composition is close to diorite in that it consists of sodic-plagioclase (oligoclase to calcic-andesine) and one or more mafic minerals (hornblende, biotite, diopside, augite, orthopyroxene); most are porphyritic with feldspar and mafic phenocrysts; the rocks may be brown, reddish, gray, or greenish but are usually not black. It is more felsic than basalt and more mafic than dacite. Named by Buch in 1826 from the Andes Mountains, South America.
Essential minerals: plagioclase, hornblende, biotite, ± pyroxene.
Accessory minerals: magnetite, ilmenite, etc.
Website: http://geology.uaic.ro/muzee/mineralogie/
Concept & 3D-modelling by dr. Andrei Ionut APOPEI
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