Andesite, Somerset. Abundant volcanic rock with a groundmass of sub-millemetre size crystals. Principal mineral plagioclase. Pyroxines, iron oxides, t

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Andesite, Somerset. Abundant volcanic rock with a groundmass of sub-millemetre size crystals. Principal mineral plagioclase. Pyroxines, iron oxides, tridymite, cristobalite and residual glass generally make up 40% of the rock.

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Photo credit: © Scenics & Science / Alamy / Afripics
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Keywords: -millemetre, abundant, andesite, basalt, birefringence, cross, crystals., dacite, groundmass, illumination, iron, microscope, mineral, mineralogy, oxides, plagioclase., polarized, principal, pyroxines, rock, size, somerset., volcanic