Beucha granite porphyry

from Wikipedia, the free encyclopedia
Beucha granite porphyry, polished, pattern approx. 24 × 15 cm

The Beucha granite porphyry rock is a result of igneous activity and therefore counts among the igneous rocks and is referred to petrographically as microsyenogranite. At times, the classification as pyroxenite porphyry was also common. The Beucha granite porphyry rock deposit is located in Beucha near Leipzig in Saxony .

Origin and composition

The Beucha granite porphyry is a gang rock-like magma body from the Unterrotliegendzeit ( Autunium ). In the north-west Saxon volcanic complex , magmas and tuffs were deposited and in the course of intrusions penetrating into it, rock deposits in the form of dikes and sticks emerged . Such a deposit situation exists with the pyroxene-bearing rhyolithoids occurring in Beucha. In its development phase, the Beucha granite porphyry included isolated fragments of other rocks such as greywacke , diorite , gabbro , hornfels , lamprophyr , diabase and fatty quartz .

The mixed parts of the Beucha granite porphyry are quartz , orthoclase , plagioclase , pyroxene , chlorite , biotite and ore minerals. The crystalline inserts give the rock its porphyry structure .

Breakdown, use and properties

An economic use of the Beucha granite porphyry began in 1884 after Lower Bavarian stonemasons had proven that the broken stone from Beucha can be processed very well as stone. This phase of intensive dismantling largely came to a standstill with the Second World War. Today in Beucha granite porphyry is still mined by a company in the “Sorge” quarry, a boiler quarry that is sunk into a flat elevation. The excavation area is currently around 6–7 hectares. In the future, mining can only expand to the southeast.

This natural stone has a green or red microcrystalline base, in which there are millimeter to centimeter-sized fragments. The Einsprenglinge consist mainly of ideomorphic orthoclases, plagioclase, quartz and some ore minerals and are optimally interlocked. Therefore, it has good durability and weather resistance. Beuchaer granite porphyry is frost-resistant and polishable. The properties of the base material and its interlocking with the snap-in elements show that it is easy to work with as a stone. It is used as architectural stone , for stair and floor coverings , paving and in horticulture and occasionally as tombstone material.

Buildings

The Völkerschlachtdenkmal in Leipzig was built in its visible parts from Beucha granite porphyry. During the construction of the Völkerschlachtdenkmal and the production of its monumental figures, the granite porphyry became known as Beucha stone . For the construction project, 26,500 stone blocks were extracted, processed and brought to Leipzig in Beucha.

literature

  • Lothar Eißmann u. a .: Beucha - village of stones. Sax-Verlag, Beucha and Markkleeberg 2012, ISBN 978-3-86729-115-6 .
  • Karlfried Fuchs: Natural stones from all over the world, discover, determine, use. Volume 1, Callwey, Munich 1997, ISBN 3-7667-1267-5 , p. 43.
  • A. Peschel: 17th work and excursion conference of the AG Geotope Protection in Thuringia, in NW Saxony, report on results and inventory calculation. 2003.

  • Beucha granite porphyry, point-sharpened, pattern approx. 25 × 15 cm

  • Beucha granite porphyry, bush hammered, pattern approx. 25 × 15 cm

Individual evidence

  1. ↑ Heiner Siedel, Jan-Michael Lange, Ferdinand Heinz: Building and decorative stones in Dresden . Dresden (Senckenberg NHSD) 2009, p. 21 ISSN  1860-3866
  2. ↑ Ludwig Pfeiffer, Manfred short, Gerhard Mathé: Introduction to Petrology . Berlin 1981, p. 86.
  3. ↑ A. Peschel: 17th working and excursion conference of the AG Geotope Protection in Thuringia, in NW Saxony, report on results and inventory calculation. 2003.
  4. ↑ Dedication p. 102.
  5. ↑ Flyer from Sax-Verlag from 2017 with information on the book "Beucha - Dorf der Steine", Sax-Verlag, ISBN 978-3-86729-115-6

Web links