Monzonite is a somewhat rare igneous rock. It was first described on Mount Monzoni in northeast Italy. The rock is one of three igneous rocks mainly compose of feldspars. The rock may also contain differing amounts of plagioclase, orthoclase, and quartz. Subsets of monzonite exists to reflect the amount of these elements. For example, one subset is quartz monzonite. It is commonly found in small massed around felsic plutons. The Curecanti Needle in the Black Canyon of Colorado provides an example of quartz monzonite. This particular subset is resistant to erosion and commonly found in mountain chains.
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| Curecanti Needle |
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Quartz Monzonite from Polarized Light Microscopy Digital Image Gallery |
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