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  Latest Training
IGNEOUS ROCKS
Publisher date : June 2008
Chapter title : IGNEOUS ROCK CLASSIFICATION
Data title : MONZONITE

  Typical Minerals

  PLAGIOCLASE - 50-100%
Orthoclase - 10-35%
Mafics - < 10%
Quartz - 0-5%

  Description

Monzonite is one of three rocks dominated by feldspar (the others being anorthosite and syenite) with occasional other minerals thrown in in lesser amounts (although the rock can go 100% plagioclase.) The plagioclase is sodium rich, unlike anorthosite which is calcium rich.
 Because monzonite is light colored it is often confused with granite but granite has quartz >20%. Monzonites with quartz 5-20% are "quartz monzonites." Less than 5% quartz and the rock is just monzonite

  Tectonic Association

 Monzonite is not a common rock, but is typically found around the edges of other felsic plutons, such as plagiogranites or granodiorites. That is, it is typical of continents.

 


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