Magnesite, magnesium carbonate, MgCO3, mineral mined and processed in Austria since about 1875. Nowadays used for the production of sintered magnesite, magnesite blocks, caustic magnesite and refractory materials. Powdered caustic magnesite is used for the production of heat and noise insulating materials. Magnesite underground mining at Breitenau am Hochlantsch (Styria), Wald am Schoberpaß (Styria) and Radenthein (Carinthia). Open-cast mining in Fieberbrunn (Tyrol) and Oberdorf/Laming (Styria, underground and open-cast mining). Processing at Breitenau am Hochlantsch, Veitsch, Oberdorf/Laming and Trieben (all in Styria), Radenthein (Carinthia), Ferndorf (Carinthia, Heraklith fibre cement production) and Hochfilzen (Tyrol, RHI AG). Mining output in 1997: about 630,000 tons of crude magnesite.