{{mi|{{refimprove|date=April 2026}}{{primarysources|date=April 2026}}}} thumb|The Burgstein The '''Burgstein''' is a rock formation, about {{Convert|10|m|ft}} high, in the valley of the Ilm in Langewiesen in the central German state of Thuringia. It is made from quartz porphyry and has been a geological natural monument since 1939, the same year a nearby allotment garden association was founded and named after the rock.<ref name=":0">{{Cite web |title=KGV "Am Burgstein" - Wissenswertes |url=https://kgv-am-burgstein-langewiesen.de/Wissenswertes |access-date=2026-04-17 |website=kgv-am-burgstein-langewiesen.de |language=de}}</ref>
It was formed when the Ilm carved out its valley and washed away the surrounding rock. When the Ilmenau–Großbreitenbach railway was built in 1881 it was exposed again because rock at its foot was removed in order to lay the railway track. The rock dates to the Pennsylvanian sub-period and belongs to the Möhrenbach Formation.
The origin of its name is not clear (''Burgstein'' literally means "castle rock"). In Langewiesen, the road of ''Burgstein'' is named after the rock.<ref name=":0" /> The municipality of Langewiesen mentions it as a landmark for cross-country skiing.<ref>{{Cite web |title=Wintersport - Stadt Langewiesen |url=https://www.langewiesen.de/Wintersport.html |access-date=2026-04-17 |website=www.langewiesen.de}}</ref>
==References== {{Reflist}}
{{Coord|50|40|37|N|10|57|15|E|type:landmark_region:DE-TH|display=title}}
Category:Rock formations of Thuringia Category:Natural monuments in Thuringia
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