Fürstensteiner diorite

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Pattern of a polished Fürstenstein diorite

The Fuerstenstein diorite or paradise called diorite comes between Książ and Nammering in Tittling in the Bavarian Forest before. It originated in the Upper Carboniferous .

geology

The Fürstenstein diorite is found in the largest distribution area of igneous rock in the Bavarian Forest. This intrusion area is surrounded by gneisses and diatexites ; it has an extension of 17 km in the north-south direction and 12 km in the east-west direction. The older diorites are 334 million years old, to which the Fürstenstein diorite is counted, while the more recent rock formations granites and granodiorites , such as Tittlinger granite and Hauzenberger granite , occurred 312 and 123 million years ago.

Rock description

The dark gray, slightly greenish Fürstenstein diorite with a grain size of 1.5 to 2 millimeters shows a regular grain structure. This diorite is composed of 37 percent gray-white plagioclase , 6 percent alkali feldspar , 35 to 38 percent hornblende , 7 percent quartz , 7 percent biotite and 5 percent each muscovite and chlorite .

It is differently dark depending on its rock layer, therefore depending on the brightness this rock is differentiated in the trade and called either Fürstenstein gray or Fürstenstein gray black .

use

In the 1950s to the 1960s, the prince stone was mainly used as a tombstone. This is related to the fact that diorites are never colorful and that dark stones were offered and preferred in cemeteries in the Federal Republic of Germany during these years. In construction work he was used for floor and stair coverings, curbs and curbs, but also for sculpting work. Furthermore, rock waste is used in the quarry for paving of all sizes and crushed into chippings. Today (2010) there is only one Fürstenstein quarry in operation.

It was installed at the University of Regensburg , secondary school in Tittling and on the castle terrace in Bad Alexandersbad .

literature

  • Karlfried Fuchs: Natural stones from all over the world, discover, determine, use. Callwey, Munich 1997, ISBN 3-7667-1267-5 .

Individual evidence

  1. ↑ Gerhard Lehrberger: Granite - The highest and the lowest. In: Winfried Helm (Ed.): Granit. Tute Druck, Salzweg 2007, ISBN 978-3-00-023087-5 , p. 42.
  2. ↑ Karlfried Fuchs: Natural stones from all over the world, discover, determine, use. Callwey, Munich 1997, ISBN 3-7667-1267-5 , p. 20.

Coordinates: 48 ° 42 ′ 39.1 "  N , 13 ° 18 ′ 43.3"  E