Andesite pebble

Andesite pebble

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Caption: Pebble of andesite, an extrusive volcanic (igneous) rock with a typical porphyritic texture, being that of twinned crystals of feldspar (white) floating in an amorphous matrix of solid lava, here of brick-red colour. This porphyritic texture is caused by exsolution, a process of separation that takes place during successive phases of crystallisation and solidification in the lava. Pebble's actual width is 100 mm.

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Keywords: andesite, brick red, crystal, crystalline, crystals, earth science, exsolution, extrusive, feldspar, geological, geology, igneous, lava, mineral, mineralogy, phenocryst, phenocrysts, porphyritic, red, rock, separation, texture, typical, volcanic

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