Monzonite
Monzonites are mesotypical , feldspar-rich , mostly medium-grained deep rocks that belong to the syenite and monzonite families. The name is derived from the Monzoni – Valacia mountain range in Trentino (Italy) east of the Fassa Valley near Moena .
Rock description and mineral inventory
The definition that is valid today is derived from the new scientific description by Waldemar Christofer Brøgger , which he published in Kristiania in 1895 and on which Walter Ehrenreich Tröger relied in 1935. The earliest scientific description of the rock comes from the French Albert-Auguste Cochon de Lapparent , which appeared in the Annales des Mines in 1864.
The monzonites are similar to the granites in their appearance, they have a granular structure and their color is determined by the alkali feldspars. The color ranges from light to dark gray, sometimes also greenish, brownish and red.
Monzonites differ from the syenites in that the plagioclase feldspars outnumber the potash feldspars in the mineral inventory. The main components of the Monzonote are 55–90% of the light minerals, of which the feldspars are 80–100% ( alkali feldspar 35–65%, plagioclase feldspar 35–65%) and quartz 0–20% or foids 0–10 percent. The dark minerals are 10 to 45 percent. The side effects are hornblende , pyroxene and biotite .
Occurrence
Monzonite occurs in close relation to granites and granodiorite formations. The occurrence areas are:
- Italy: Monzoni intrusion near Moena in the Fassa Valley and southwest of it around Predazzo , Fleimstal , Trentino (see also Mangerite )
- Germany: Meißen massif , well-known outcrops are the Ratssteinbruch in Plauenschen Grund near Dresden and are located in the Saxon Lößnitz
- Canada: Québec
- South norway
- Ivory Coast
- Iran at Khorasan
- Australia: New South Wales
Emergence
Monzonite magma is formed by magmatic differentiation . Monzonites do occur in large syenite-monzonite batholiths or in smaller intrusions . But they also arise from metasomatic processes in which alkalis are added.
use
Monzonites are used in the same way because of their technical properties, which are similar to granites. They are used regionally for road construction and some types as decorative stone for facades, stair and floor coverings, window sills and kitchen worktops .
Natural stone types
- Sienite di Balma (Italy)
- Khoransan Azur (Iran)
- Monzonite Verde (Italy)
literature
- Friedrich Müller : International Natural Stone Index (INSK). 10 Bd., Ebner Verlag, 3rd edition Ulm 1987.
- Walter Schumann: The Great Stone and Mineral Guide ; BLV Verlagsgesellschaft mbH, 1990
- Dietmar Reinsch: Natural stone studies. An introduction for civil engineers, architects, preservationists and stonemasons . Enke. Stuttgart 1991. ISBN 3-432-99461-3
Web links
Individual evidence
- ↑ Ehrenreich Tröger: Special petrography of igneous rocks. A nomenclature compendium . Berlin 1935, p. 115, entry 259
- ↑ Kurt Huhle, Jan-Michael Lange: About an occurrence of permosiles in the subsoil of the Wackerbarth Castle in Radebeul (Saxony). In: Geologica Saxonica. Jhrg. 56, 2010, No. 2, pp. 127–136 ( PDF 1.32 MB)
- ↑ Reinsch: Natural stone studies. P. 106 (see literature)