Tonalite, Renfrew, Ontario
Tonalite is an igneous, plutonic (intrusive) rock, of felsic composition, with phaneritic (coarse-grained) texture. Feldspar is present as plagioclase (typically oligoclase or andesine) with alkali feldspar making up less than 10% of the total feldspar content. Quartz (SiO2) is present as more than 20% of the total quartz-alkali feldspar-plagioclase-feldspathoid (QAPF) content of the rock.
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Photo credit: © Phil Degginger / Alamy / Afripics
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Keywords: composition, diorite, felsic, igneous, intrusive, ontario, phaneritic, plutonic, quartz, renfrew, rock, texture, tonalite
