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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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135 news items

Tue, 19 May 2015 05:22:30 -0700

the aggressive expansion at depth and along strike of high-grade Ag-Pb- Zn mineralization identified in the Blind and El Sol mineral zones; -- the delineation of new targets on the margins of the Central Monzonite Intrusion including the area of Mina ...

Montana Standard

Montana Standard
Sat, 25 Apr 2015 23:02:04 -0700

The Butte host rock is a quartz monzonite that contains 16 percent quartz (free silica). The ore veins contain up to 50 percent quartz. The Central Zone, including the Leonard, Colusa and St. Lawrence underground mines and the Berkeley Open Pit is the ...

African Mining

African Mining
Tue, 12 May 2015 05:45:00 -0700

Phase 1 will test the Namdini strike extensions to the north within the Birimian volcaniclastics and Phase 2 will evaluate the monzonite granitoid quartz stockworks where there are shallow artisanal workings. Subject to the information received during ...

Proactive Investors Australia

Proactive Investors Australia
Mon, 27 Apr 2015 22:30:06 -0700

Interpretation of a 2008 High Ridge Resources Inc Induced Polarisation survey has identified a chargeability high within favourable monzonite host rocks at the East Chanape target. The projected surface expression measures 500 metres with modelling ...

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 ...
Corning Leader
Wed, 22 Apr 2015 08:56:15 -0700

arches national park. It's called "America the Beautiful" for a reason. In the US, geography and climate fluctuate drastically from state to state, resulting in a landscape that is as varied as it is stunning. In celebration of Earth Day, we set out to ...

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 ...
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, ...

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