Image: Hornblende andesite (GeoDIL number - 91)
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Description: This andesite is an extrusive igneous rock with black hornblende crystals in a light-gray groundmass. The fine grained matrix is composed of plagioclase micro-crystals, very small prisms of clinopyroxene and dots of magnetite. This sample is about 10 cm across.
Usage Terms: Public domain
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