The Tonalite reference article from the English Wikipedia on 24-Apr-2004 (provided by Fixed Reference: snapshots of Wikipedia from wikipedia.org)

Tonalite

Tonalite is an igneous, plutonic (intrusive) rock, of felsic composition, with phaneritic texture. Mineral assembly is composed typically of plagioclase, more than 20% of quartz and rare alkali feldspar. Amphiboles and pyroxenes are common accessory minerals.

Trondhjemite is a variety of tonalite where biotite is the only mafic mineral.

See also: igneous rocks, list of rocks

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