Friedeberger granite
Friedeberger Granite comprises an extensive granite deposit in the Czech Republic near Žulová (Friedeberg) in the Reichensteiner Mountains .
Occurrence
The mass of granite is limited by the Sudetenostrandlinie , in the east and southeast by crystalline slate near Lázně Jeseník (Bad Graefenberg) near Jeseník (Freiwaldau) and Velké Kunětice (Groß-Kunzendorf). The massif dips to the north, to the south and north of Jarnołtów (Dürrarnsdorf), north of Nadziejów (Naasdorf), on Kamienna Góra (Steinberg) and in the west between Kaní hora (Hutberg) near Tomíkovice and in Bernartice u Javorníka (Barzdorf) to reappear. Outside the large granite massif, granite emerges sporadically and with smaller deposits on the east side on Studniční vrch (Deer Bath) near Česká Ves (Bohemian village) and Písečná u Jeseníku (Sandhübel) on the mountains Habichtkopf, Scholzenberg and south of the White Stones, further south of Široký Brod (Breitenfurt) and Hradec-Nová Ves (Gröditz) in the valley floor as well as near Nieradowice (Nitterwitz), a district of Otmuchów (Ottmachau).
Rock description and mineral inventory
The large occurrence of hard rock Friedeberger granite, which was of great importance for the Sudeten German granite industry, can be divided into granite and diorite .
The granites were divided into three groups: The main granite , in which the alkali feldspars and the plagioclase are contained in approximately equal proportions. The main granite is roughly in the middle of the deposit. The marginal granite, in which the alkali feldspars predominate, lies in the west and south-west. The Steinberg granite is divided around the edge of the granite mass and the plagioclase predominate over the alkali feldspars. The main components of these granites are quartz , microcline , and partly orthoclase , biotite (dark mica) and oligoclase . Accessory involved are zircon , apatite and little magnetite .
Dismantling and use
The diorites included in the granite deposit, which were preferred natural stones because of their dark color , were quarried in quarries on Hutberg near Žulová as Hutberg diorite with proportions of horn blends. Furthermore, a marble deposit with contact minerals such as garnet , Vesuvian , epidote and wollastonite was enclosed by the Friedeberger granite on the church hill near Žulová . Quartz veins can also be found in the Friedeberger granite in various places, which were quarried near Kobylá nad Vidnavkou (Jungferndorf) for glass production. Further quartz veins are located east of Žulová and between Nieder-Rotwasser and Stará Červená Voda (Old Red Water). Furthermore, the granite pluton penetrated into layers of slate and locally migmatites (mixed gneiss) such. B. at Supíkovice (Saubsdorf) and Mikulovice u Jeseníku (Niklasdorf) on the Dickelsberg. The Saubsdorf marble and marmur sławniowicki from Sławniowice (Groß-Kunzendorf) crystallized through the heat and pressure of the resulting granite.
Friedeberger granite was used for solid and bridge constructions, for stone , floors and stairs, paving stones, bricks and columns.
See also
- Geology of the Reichenstein Mountains
- State college for stone processing in Friedeberg
- List of types of granite
literature
- L. Finckh and G. Götzinger: Explanation of the geological map of the Reichensteiner Mountains, the Nesselkoppenkamm and the Neisse foreland, ed. v. of the Federal Geological Institute in Vienna, Austrian State Printing Office, Vienna 1931.
