rauhwacke
/ˈraʊvakə/(also rauchwacke, rauwacke) Geology
noun
A dolomitic limestone of the Upper Permian or Zechstein group in Germany, corresponding to the magnesian limestone of England; (more generally) a magnesian limestone thought to resemble this.
Origin
Early 19th century; earliest use found in Annals of Philosophy. From German Rauhwacke from rauh (now rau) rough + Wacke.