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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]

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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98 news items

 
Financial Wisdom Works
Fri, 04 Sep 2015 03:18:45 -0700

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 porphyry stock. The Company holds exploration licenses surrounding the Copler deposit cover a 15 ...

Access Atlanta

Access Atlanta
Fri, 07 Aug 2015 11:11:15 -0700

The protruding 825 feet of monstrous granite is nothing short of spectacular, and the park housing the behemoth is Georgia's most popular attraction. The dome of quartz monzonite is thought to have been formed at the same time as the Blue Ridge Mountains.
 
Canadian Mining Journal
Tue, 25 Aug 2015 13:28:39 -0700

Medallion noted that phosphate typically makes up 24% to 29% of the monzonite. Phosphate is liberated during the extraction of rare earths and then converted to calcium phosphate, used globally as a livestock feed supplement. The by-product may provide ...
 
Watch List News
Wed, 02 Sep 2015 03:52:30 -0700

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 porphyry stock. The Company holds exploration licenses surrounding the Copler deposit cover a 15 ...
 
Yahoo7 News
Sun, 16 Aug 2015 17:11:15 -0700

The Buccaneer mineralisation is mostly contained within a syeno-monzonite porphyry intrusion, in sheeted shallowly dipping quartz veins and stockwork zones. The oxide and oxide/fresh transition zones extend from surface to approximately 120 metres ...

WMUR Manchester

WMUR Manchester
Mon, 29 Jun 2015 21:00:25 -0700

The gorge walls were formed from types of granite like Kinsman Quartz Monzonite and Pegmatite Dikes. WOODSTOCK, N.H. —The Lost River Gorge and Boulder Caves in New Hampshire is expanding to include an "out-of-the-gorge" experience. 20 things ...

Montana Standard

Montana Standard
Sat, 25 Apr 2015 23:02:04 -0700

The Butte host rock is a quartz monzonite that contains 16 percent quartz (free silica). The ore veins contain up to 50 percent quartz. The Central Zone, including the Leonard, Colusa and St. Lawrence underground mines and the Berkeley Open Pit is the ...

Los Angeles Times

Los Angeles Times
Sat, 24 Jan 2015 16:48:28 -0800

At mile 26, you encounter the Grandstand, an enormous hunk of dark quartz monzonite at the north end of the lake bed. About mile 27, you park and look for rocks and tracks. Scientists theorize that the lake evaporated about 10,000 years ago, leaving ...
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