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Not to be confused with the rare earth-bearing phosphate mineral Monazite.
Photomicrograph of thin section of monzonite (in cross polarised light)
Photomicrograph of thin section of monzonite (in plane polarised light)
An intrusion (Notch Peak monzonite) inter-fingers (partly as a dike) with highly metamorphosed host rock (Cambrian carbonate rocks). From near Notch Peak, House Range, Utah

Monzonite is an igneous intrusive rock. It is composed of approximately equal amounts of plagioclase and alkali feldspar, with less than 5% quartz by weight.[1] It may contain minor amounts of hornblende, biotite and other minerals. If quartz constitutes greater than 5%, the rock is termed a quartz monzonite.[2]

If the rock has a greater percentage of alkali feldspar, it grades into a syenite. With an increase in calcic plagioclase and mafic minerals the rock type becomes a diorite. The volcanic equivalent is the latite.[2]


Monzonite was originally named after the Monzoni range in Val di Fassa (Trento Province - Italy) where it is abundant. As rock definitions have been systematized and codified, this association has lost any relevance to the rock's definition.[1]

See also[edit]


  1. ^ a b Le Maitre, R.W., Igneous Rocks: A Classification and Glossary of Terms Cambridge University Press, 2nd ed, pp. 113 ISBM 0-521-66215
  2. ^ a b Klein, Cornelis and Cornelius S. Hurlbut, Jr., Manual of Mineralogy, Wiley, 20th ed, pp. 480-484 ISBN 0-471-80580-7

Original courtesy of Wikipedia: http://en.wikipedia.org/wiki/Monzonite — Please support Wikipedia.
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1275 videos foundNext > 

William T. Hathaway: Huge Quartz Monzonite Boulder Near Renan, VA

Naturalist William T. Hathaway of PittPaths.com describes the geological background of a quartz monzonite boulder near Renan, Pittsylvania County, Virginia. 1993.

WHERE TO FIND GOLD !!! In Quartz Granite ( Monzonite )

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William T. Hathaway: Quartz Monzonite Dike Near Renan, VA

Naturalist William T. Hathaway of PittPaths.com describes the geological background of a quartz monzonite dike near Renan, Pittsylvania County, Virginia. 1993.

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90 news items

LA Observed
Sat, 28 Mar 2015 21:30:00 -0700

Rock (quartz monzonite) against sky (blue. Unrelenting blue.) JT, view from Mastodon Peak19 3-15 - Copy.JPG The summit of Mastodon Peak, where you are queen of the realm. Because no one's there to argue otherwise. JT, chuckwalla tail in crevice, ...
Wed, 25 Mar 2015 16:03:45 -0700

Mineralized veins and associated alteration envelope are hosted within granodiorite to quartz-monzonite. The assay database used to construct the Tinta vein resource file included samples from diamond drill holes and underground development.
Willcox Range News
Wed, 18 Mar 2015 12:07:30 -0700

The discussion will focus on the origin of the quartz monzonite of Texas Canyon and the formation of copper ore bodies that include Johnson Camp. Here at the edge of the continental plate that makes up much of North America the geology is complex but ...

Los Angeles Times

Los Angeles Times
Sat, 24 Jan 2015 16:48:28 -0800

At mile 26, you encounter the Grandstand, an enormous hunk of dark quartz monzonite at the north end of the lake bed. About mile 27, you park and look for rocks and tracks. Scientists theorize that the lake evaporated about 10,000 years ago, leaving ...

News da Predazzo e dal mondo

News da Predazzo e dal mondo
Tue, 17 Mar 2015 00:57:26 -0700

Le colonne monolitiche dell'interno furono ricavate da un unico blocco di monzonite, isolato a ovest del paese presso l'Avisio. La pala dell'altare maggiore con Gesù Maestro e i santi Filippo e Giacomo porta la firma “Nobili – Roma -1870”; sono invece ...

Arizona Daily Star

Arizona Daily Star
Sun, 01 Feb 2015 18:34:53 -0800

Rare-earth bearing pegmatite localities in Arizona include the Rare Metals mine in the Aquarius Cliffs in Mohave County, producing rare-earth and thorium minerals such as allanite, chevkinite, euxenite, gadolinite and monzonite. Found at the Kingman ...
Thu, 05 Feb 2015 06:03:45 -0800

Asarco conducted an exploration and deep drilling program in the Tombstone District in 1973 to 1975 to target porphyry copper deposits thought to be associated with Laramide granodiorite and quartz monzonite plutons within the Tombstone caldera ...

Eastern Arizona Courier

Eastern Arizona Courier
Wed, 03 Dec 2014 23:14:49 -0800

The Texas Canyon quartz monzonite, exposed at the rest area, is the intrusion that carried the minerals from deep within the earth. The deposit as mapped is large and copper concentrations adequate to support the project. Extensive hydrological studies ...

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