Sander sandstone

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Uncleaned sculpture by Ferdinand Tietz in Seehof Castle made of sandstone
Sculpture after cleaning

Sander sandstone , which is also called Sander reed sandstone or Green Main sandstone , occurs in Sand am Main near Haßberge , eight kilometers southwest of Haßfurt in Lower Franconia . This sandstone belongs to the Stuttgart Formation (formerly also reed sandstone or reed sandstone layers) of the Middle Keuper . The Stuttgart formation is dated to the international Carnium stage.

Rock description and mineral inventory

The overall impression of this sandstone is greenish. It is a brownish to olive colored, fine to medium-grained sandstone, which is clayey-chloritic and partly quartzitic. It consists of 54 percent quartz and 32 percent rock fragments, 7 percent plagioclase and 3 percent alkali feldspar, as well as a proportion of the accessories of 2 percent ( tourmaline , rutile , apatite and opaque (opaque) ore). The most common grain size is 0.15 millimeters. It shows parallel and oblique stratification and has no pronounced storage. It is a feldspar-bearing sandstone that is moderately weather-resistant due to its high porosity . This can be seen in the formation of sand, scales and cracks. There are sandstone layers in the quarry that are well weather-resistant. Fading can take place in intense sunlight.

use

It was used for solid buildings, floor and wall coverings, tombs and above all for stone carving . Due to the location of the quarries, Sander Sandstein was shipped down the Main to the Netherlands . Sander sandstone was used by the stone sculptors for the original sculptures of the Würzburg residence due to its easy processing and good malleability . It was also installed at the Ursuline Convent in Würzburg , Castel Castle in Gent in Belgium , Wiesentheid Castle and Seehof Castle near Bamberg in Memmelsdorf .

See also

literature

  • Wolf-Dieter Grimm: picture atlas of important monument rocks of the Federal Republic of Germany. Published by the Bavarian State Office for Monument Preservation, Lipp-Verlag, Munich 1990, ISBN 3-87490-535-7 .

Individual evidence

  1. ↑ Grimm: Pictorial atlas of important monument rocks. Rock no.095 (see literature)