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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: 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. ...

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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14 news items

The Northern Miner (subscription)
Thu, 23 Oct 2014 11:00:00 -0700

The deposit is hosted in a sequence of volcanic units intruded by a monzonite intrusive complex with the gold mineralization dominantly hosted in the monzonite units but also in the adjacent volcanics. Lion One completed a merger in June 2013 with ...

Billings Gazette

Billings Gazette
Mon, 13 Oct 2014 14:00:00 -0700

The forested slopes of the Highland Mountains enclose about 50 spires of quartz monzonite, some sticking 600 feet above the trees. A pleasant dayhike starts in a wildflower-filled creek drainage sprinkled with random piles of granite boulders. Much of ...
Junior Mining Network
Thu, 16 Oct 2014 06:07:30 -0700

Boxxer Gold Corp. ( TSX VENTURE : BXX) ( PINKSHEETS : BXXRF) (the "Company", or "Boxxer") is pleased to announce the analytical results for the diamond drilling program completed on the DOK copper-gold project located in northwest British Columbia.
SYS-CON Media (press release)
Tue, 14 Oct 2014 07:06:17 -0700

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 ...
Canadian Mining Journal
Thu, 16 Oct 2014 13:37:30 -0700

The second hole intersected three intervals averaging >0.10% CuEq in strongly potassic and phyllic altered andesite and quartz monzonite intrusive. This hole contains elevated concentrations of copper-gold-silver. Continental said it hopes to have ...
Junior Mining Network
Tue, 23 Sep 2014 06:52:30 -0700

The poorly exposed Buff target is located approximately one kilometer southwest of the Chrysocolla East target and approximately 1.8 kilometers southwest of the Central Monzonite South target. Although mostly covered by thick glacial overburden, the ...
Yahoo Finance UK
Wed, 17 Sep 2014 14:33:45 -0700

The Silasselkä property is underlain by metavolcanic and metasedimentary rocks that are intruded by substantial volumes of younger monzonite, granodiorite and gabbro bodies. Relationships between the various igneous intrusions in the area are not ...
Junior Mining Network
Wed, 08 Oct 2014 05:00:00 -0700

The center of the KV target is located 850 metres south of the previously reported Kwil target (September 9th, 2014 Press Release) and 800 metres east of the Central Monzonite South target (see Tower's August 25th, 2014 Press Release). Here ...

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