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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]

Etymology[edit]

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]

http://it.wikipedia.org/wiki/Monzoni

References[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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5 news items

 
Junior Mining Network
Mon, 14 Apr 2014 13:03:45 -0700

The DOK property exhibits widespread copper-gold-silver mineralization (with minor concentrations of molybdenite) in potassic altered andesite of the Stuhini Group and altered quartz monzonite, quartz diorite, and granodiorite intrusives. The ...
 
MarketWatch
Tue, 08 Apr 2014 05:00:00 -0700

Central Monzonite Zone - The large Central Monzonite copper and gold porphyry target in the core of the Durand Stock is more than 1.5 km long along an east trending axis. Historically the area has been poorly tested, however it comprises the highest ...

International Business Times AU

International Business Times AU
Wed, 09 Apr 2014 15:30:00 -0700

Gold occurrences were determined onsite, appearing in veins, and distributed over pyrite in the form of quartz monzonite and mica schist with sericite carbonate alteration. Premium's drilling contractor completed fifteen drill holes at the site; three ...

ISN

ISN
Thu, 27 Mar 2014 00:47:28 -0700

TREI would use monzonite sand provided by India's Indian Rare Earths Limited in its production of REEs. Last November, Japan and India signed a trade pact on Indian exports to Japan, and Tokyo and Delhi are considering forming joint ventures operating ...
 
Canadian Mining Journal
Tue, 18 Mar 2014 03:52:30 -0700

... tonnes to 1,000,000 tonnes of approximately 1.0 to 1.8% copper equivalent (0.7% to1% copper, 0.25 to 1 g/t Au and 10 to 20 g/t Ag) as well as deeper-rooted mineralized cross-structures and copper-gold-silver mineralized porphyritic monzonite porphyry.
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