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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

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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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105 news items

Cherry Hill Courier Post

Cherry Hill Courier Post
Thu, 09 Apr 2015 18:07:30 -0700

I'm talking about dolomite and monzonite, serpentine and greywacke. And down here? Well, we're a coastal plain — with the emphasis on plain. We have sand, silt and clay and not much else from Cape May County to Monmouth County and along the ...
Thu, 09 Apr 2015 14:22:30 -0700

Lastly, the Muddy Creek gold occurrence, an Intrusion Related Gold system geologically distinct from the Whistler and Island Mountain porphyry systems, is comprised of sheeted, centimetre-wide gold-sulphide veins in fractured monzonite intrusive with ...
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, ...
Willcox Range News
Wed, 01 Apr 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 ...

Proactive Investors USA & Canada

Proactive Investors USA & Canada
Tue, 31 Mar 2015 17:33:08 -0700

The project area is crossed by the west-northwest trending Lachlan Transverse Zone, an inferred arc-normal structural corridor that is interpreted to have influenced the emplacement of mineralising monzonite intrusions (Cadia) and felsic volcanic ...
Tue, 31 Mar 2015 11:15:04 -0700

... is engaged mining, development, exploration and production of mineral deposits in Turkey. The Company owns 80% interest in the Copler Gold Mine, which is an epithermal gold-silver-copper deposit, centered on a composite diorite to monzonite ...
Mideast Time
Thu, 02 Apr 2015 11:44:00 -0700

Alacer Gold Corp logo Alacer Gold Corp (TSE:ASR) had its target price lifted by CIBC from C$3.50 to C$4.00 in a research note released on Tuesday morning. They currently have an outperform rating on the stock. Shares of Alacer Gold Corp (TSE:ASR) ...
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.

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