Tonalite definition

Tonalite means a coarse grained intrusive rock consisting of dominantly plagioclase feldspars and mafic minerals (biotite and/or hornblende) and accessory quartz.
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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.

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