Andesite rock, light micrograph

Andesite rock, light micrograph

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Caption: Andesite rock. Polarised light micrograph of andesite, a volcanic rock with a typical porphyritic texture. Large twinned crystals (phenocrysts) of feldspar (white) float in a finely crystalline matrix (black). The porphyritic texture is caused by ex-solution, a process of separation that takes place during successive phases of crystallisation in the lava. This thin section image has been obtained using cross-polarised light (or 'crossed nichols').

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Keywords: andesite, cross polarised, cross-polarised, cross-polarized, crossed nichols, crystal, crystalline, crystals, earth science, ex-solution, feldspar, geological, geology, light micrograph, light microscope, lm, mineral, mineralogy, minerals, phenocryst, phenocrysts, plm, polarised light micrograph, polarised light microscopy, polarized, polarized light micrograph, polarized light microscopy, porphyritic, rock, rocks, section, sectioned, separated, separation, thin section, volcanic

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