Tonalite is an igneous, plutonic (intrusive) rock, of felsic composition, with phaneritic
is present as plagioclase
(typically oligoclase or andesine) with 10% or less alkali feldspar
is present as more than 20% of the rock. Amphiboles and pyroxenes are common accessory minerals.
In older references tonalite is sometimes used as a synonym for quartz
diorite, however the current IUGS classification defines tonalite as having greater than 20% quartz
diorite with from 5 to 20% quartz
Trondhjemite is a variety of tonalite with biotite
as the only mafic mineral, named after Norway's third largest city, Trondheim.
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