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monzonite |
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monzoniteType of igneous rock that contains abundant and approximately equal amounts of plagioclase and potash feldspar, as well as other minerals. The type region is Monzoni, Italy, in the Italian Tirol; similar rocks have been described from Montana, Norway, Sakhalin Island, and other localities. Monzonite is not rare, but it generally occurs in rather small, heterogeneous masses mixed with diorites, pyroxenites, or gabbros. monzonite [′män·zə‚nīt] (petrology) A phaneritic (visibly crystalline) plutonic rock composed chiefly of sodic plagioclase and alkali feldspar, with subordinate amounts of dark-colored minerals, intermediate between syenite and dorite. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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Small and isolated intrusions of diorite, gabbro, gabbronorite, ultramafic rocks, monzonite, syenite and anorthosite constitute about 2% of the area. About nine miles from the junction is Cimarron Canyon State Park, where you can stand at the base of a palisades sill - a spectacularly sheer monzonite cliff face. Mineral point count analysis identifies the predominant phase of this rock as a quartz monzonite. |
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