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Igneous rock
Monzonite specimen from Rock Library (NASA JPL)
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]


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 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

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124 news items

Mon, 30 Nov 2015 05:30:00 -0800

Strongly silicified rhyolitic volcanic rocks and quartz monzonite with well-developed sericite and oxidized pyrite were encountered in the first 2 lines, which is similar to mineralization style known at Fresnillo's Noche Buena Mine located 35 ...

Proactive Investors Australia

Proactive Investors Australia
Thu, 26 Nov 2015 13:33:45 -0800

The project's Mordialloc prospect has been drilled at depth by previous workers and it contains sheeted porphyry copper-gold bearing veins on the margin of a coarse-grained monzonite porphyry stock. The best intercept in this area produced 48 metres at ...

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 ...

Mining Technology

Mining Technology
Mon, 16 Nov 2015 07:22:30 -0800

... include quartz monzonite and related rocks of the Idaho batholith (Cretaceous age), featuring large roof hangings of metamorphosed sedimentary rocks such as quartzite, quartzitic conglomerate, mica schist, metamorphosed limestone, dolomite and tactite.

ABN Newswire (press release)

ABN Newswire (press release)
Tue, 24 Nov 2015 18:26:15 -0800

Perth, Nov 25, 2015 AEST (ABN Newswire) - Cardinal Resources Limited ( ASX:CDV) ("Cardinal" or "the Company") is pleased to announce that the maiden diamond drill hole has been completed on the Namdini Project ("Namdini"), (Figure 1, see link below) ...

Proactive Investors Australia

Proactive Investors Australia
Sun, 22 Nov 2015 15:12:18 -0800

These rock units are intruded by felsic monzonite granitoids and quartz diorites. The gold mineralisation is developed within foliated, sheared and highly altered rocks containing sulphides (pyrite and arsenopyrite). Analysis The portents of the first ...


Mon, 23 Nov 2015 05:07:30 -0800

To the south and east of the knoll are several low-lying outcrops of medium- to fine-grained granodiorite to quartz monzonite with minor irregular xenoliths of older gneissic rock as well as garnet skarn. A low-lying ridge about 500 meters to the south ...
Marketwired (press release)
Tue, 17 Nov 2015 05:07:30 -0800

The high-grade interval in B-048 beginning at a depth of 2,588.5 feet is a distinctive zone of strongly altered quartz monzonite containing coarse chalcopyrite, magnetite, actinolite and chlorite. Its significance and aerial extent will be determined ...

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