Tonalite definition
Tonalite means a coarse grained intrusive rock consisting of dominantly plagioclase feldspars and mafic minerals (biotite and/or hornblende) and accessory quartz.
Examples of Tonalite in a sentence
Drill hole VSTA047 intersected the contact zone displaying minor hornfelsing of a Lalkaldarno Tonalite like intrusive.
Mapping by Buckland suggested a thickened volcanic pile of Nanapundah and Towanway Tuff, and intrusion by the Lalkaldarno Tonalite.
Field checking of the area uncovered a rock sample of Lalkaldarno Tonalite with fine disseminated malachite staining, and other rock chips of jasperoidal chert.