Monzonite

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Related to monzonites: Quartz monzonite

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.

Monzonite

 

(named after the city of Monzoni, Italy, in the Tirol), crystalline igneous rock consisting of approximately equal amounts of common potash feldspar and lime-soda feldspar (orthoclase and labradorite) and of a ferromagnesian mineral, usually pyroxene. In more acid varieties of monzonite a small amount of quartz may also be present; in more basic kinds there may be olivine. Chemically the group of monzonite rocks occupies an intermediate position between gabbros and syenites (average silica content of 55–65 percent); therefore monzonites are also called gabbro-syenites. Monzonite is a dense large-grained rock that is attractive when polished. It is used as a building material. Monzonites occur in many regions of the USSR—for example, the Ukraine and the Baikal region; abroad they are found in Italy, Norway, and other countries.

References in periodicals archive ?
In general, quartz varieties in granites, monzonites and diorites that have crystallized at higher temperatures contain more trace elements in its crystal structure than the quartz formed at lower temperature (Larsen et al.
The porphyry mineralization occurs in a potassic alteration zone, mapped to date by BHP, over 600 m on the southeastern margin of the Miocene Pliocene Porphyry Bini Property Complex, a body of intrusive granodiorite and monzonites.
The center of the Sokan Gold Project appears to exhibit the characteristics of a classic southwest US porphyry and related epithermal system with massive sulfides, quartz monzonites, breccia pipes and argillic/silicic alteration; with anomalous values in gold and copper.
The center of the Sokan property appears to exhibit the characteristics of a classic southwest US porphyry and related epithermal system with massive sulfides, quartz monzonites, breccia pipes and argillic/silicic alteration; with anomalous values in gold and copper.