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Monzonite
Igneous rock
Monzonite.jpg
Monzonite specimen from Rock Library (NASA JPL)
Composition
Mostly plagioclase and alkali feldspar


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]

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]

References[edit]

  1. ^ a b Le Maitre, R.W., Igneous Rocks: A Classification and Glossary of Terms Cambridge University Press, 2nd ed, pp. 113 ISBN 0-521-66215-X
  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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703 news items

ABN Newswire (press release)

ABN Newswire (press release)
Thu, 28 Apr 2016 17:33:45 -0700

The monzonite granitoids are medium to coarse grained with quartz vein stockworks and are usually altered to pale green epidote with patches of pink to reddish albite (alkali feldspar). Sulphides of pyrite and arsenopyrite are contained within these ...

Bay Post/Moruya Examiner

Bay Post/Moruya Examiner
Tue, 26 Apr 2016 16:48:45 -0700

... garden of Catriona and Phil whose property is located on the edge of the escarpment overlooking Lake Conjola and Milton and is a garden set on the rich soils of former rainforest pockets comprising two hectares of volcanic soil known as Milton ...

BreakingNews.com

BreakingNews.com
Sat, 23 Apr 2016 07:59:18 -0700

Stone Mountain is a quartz monzonite dome monadnock and the site of Stone Mountain Park in Stone Mountain, Georgia. At its summit, the elevation is 1,686 feet (514 m) MSL and 825 feet (251 m) above the surrounding area. Stone Mountain is well-known ...

Mining Technology

Mining Technology
Mon, 18 Apr 2016 09:41:15 -0700

The project involves the development of the North Star deposit, which is located on the eastern boundary of the Little Dragoon Mountains, the southern portion of which primarily hosts Tertiary Texas Canyon Quartz Monzonite, whereas the northern half of ...

ABN Newswire (press release)

ABN Newswire (press release)
Wed, 06 Apr 2016 16:39:33 -0700

The monzonite granitoids are medium to coarse grained with quartz vein stockworks and are usually altered to pale green epidote with patches of pink to reddish albite (alkali feldspar). Sulphides of pyrite and arsenopyrite are contained within these ...
 
MarketWatch
Thu, 31 Mar 2016 09:18:45 -0700

This mineralization was hosted as primary and supergene-style in altered monzonite and as supergene-style mineralization in a later barren granite. This intercept was also bound, up-hole, by a relatively silver-rich interval containing 8.5 g/t Ag over ...

KCET

KCET
Tue, 05 Jan 2016 12:01:43 -0800

Cima Dome, Mojave National Preserve: Though there's precious little surface water here in the heart of the Mojave Preserve, that doesn't mean there are no birds to look at. The broad quartz monzonite shoulders of the Dome support the world's largest ...

Arizona Daily Star

Arizona Daily Star
Sun, 15 Nov 2015 12:01:22 -0800

Extensive churn drilling through limestone, quartzite and monzonite on property revealed existing ore bodies reported to have carried about 8 percent copper. The high-grade upper levels of the Mary and Germania mines confirmed these findings. Courtland ...
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