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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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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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107 news items

Petroleum News
Fri, 19 Dec 2014 08:49:15 -0800

This hole intersected two separate zones, about 80 to 100 meters wide of heterolithic, magnetite flooded breccia cross-cutting a porphyritic quartz monzonite. The quartz monzonite is moderately to strongly sericite-pyrite altered, and contains local ...
Tue, 02 Dec 2014 14:01:37 -0800

Numerous intervals of anomalous copper, molybdenum, zinc and silver occur throughout the hole; the best of which are hosted in strongly chlorite-epidote altered quartz monzonite and magnetite altered breccia containing fragments of biotite altered ...
Thu, 11 Dec 2014 05:52:30 -0800

... a sill-like monzonite intrusion of Jurassic age. This is the same type of geological setting as many of the major copper-gold deposits in the Golden Triangle area of northwest British Columbia except that Spectrum has demonstrated much higher gold ...
Willcox Range News
Wed, 26 Nov 2014 10:56:15 -0800

The Texas Canyon quartz monzonite, exposed at the rest area, is the intrusion which carried the minerals from deep within the earth. The deposit as mapped is large and copper concentrations adequate to support the project. Extensive hydrological ...
SYS-CON Media (press release)
Thu, 04 Dec 2014 06:26:15 -0800

VANCOUVER, BRITISH COLUMBIA -- (Marketwired) -- 12/04/14 -- Metallis Resources Inc. (TSX VENTURE: MTS) (the "Company" or "Metallis Resources") is pleased to announce it has expanded the Kirkham Property by staking an additional 605 hectares.
SYS-CON Media (press release)
Tue, 02 Dec 2014 05:30:00 -0800

The Cretaceous quartz monzonite intrudes the older rocks and flanks the Takomkane Batholith to the East. Eight stages of oscillatory magmatic activity have been recognized at the Boss Mountain deposit, three of which resulted in the emplacement of the ...
Fri, 14 Nov 2014 06:41:30 -0800

From 190.1 metres the hole entered equigranular monzonite and other possible strongly altered intrusive rocks, before encountering a 30 metre wide structural zone at 353 metres. From 383 metres to end of hole at 483.1 metres there is a package of dark ...
Petroleum News
Fri, 31 Oct 2014 07:49:47 -0700

Company geologists believe this block acted as a significant fluid trap in the contact zone with the quartz monzonite to the northeast. Banks Island geologists believe this discovery has the potential to develop into a mineralized zone and are working ...

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