Monzonite

Monzonite are mesotype, feldspar, mostly medium -grained plutonic rocks belonging to the syenite and monzonite family. The name is derived from the Monte Monzoni the Val di Fassa in Trentino (Italy).

Description of rock and mineral composition

The currently valid definition is derived from the scientific redescription of Waldemar Christofer Brøgger, which he published in 1895 in Kristiania and what Walter Ehrenreich Tröger 1935 was based. The earliest scientific description of the rock, however, comes from the French Albert Auguste Cochon de Lapparent that appeared in the Annales des Mines in 1864.

The monzonite similar to granite in appearance, they have a grainy texture and their color is determined by the alkali feldspars. The color ranges from light to dark gray, sometimes greenish, brownish and red.

Monzonite differ from the syenites fact that the Plagioklasfeldspäte outweigh the Kalifeldspäten in mineral content. The Hauptgemengteile the Monzonote are at the bright minerals 55-90 %, of which amount to the feldspars 80-100 % ( 35-65 % alkali feldspar, Plagioklasfeldspat 35-65 %) and quartz 0-20 % or 0-10 Foide percent. The dark minerals are 10 to 45 percent. The Nebengemengteile are hornblende, pyroxene and biotite.

Occurrence

Monzonite occurs in close relationship with granites and Granodioritbildungen. The occurrences of application are:

  • Italy: Monzoni intrusion, Val di Fassa, Trentino
  • Germany: Meissen massif, known outcrops are the Council quarry in Plauensche reason at Dresden and are located in the Saxon Loessnitz
  • Canada: Quebec City
  • Southern Norway
  • Ivory Coast
  • Iran in Khorasan
  • Australia: New South Wales

Formation

Monzonitische magma produced by magmatic differentiation. Monzonite come quite in large syenite - monzonite batholiths before or in smaller intrusion. However, they also arise from metasomatic processes in which alkalis are supplied.

Use

Monzonite are used due to their technical characteristics similar to the granites in the same way. Regional they are used for road construction and some varieties as decorative stone for facades, stairs and flooring, window sills and kitchen countertops.

Natural stone varieties

  • Sienite di Balma (Italy )
  • Khoransan Azur (Iran)
  • Monzonite Verde ( Italy)
Fassa Valley Metasomatism
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