Minerals, crystals and fossils take centre stage at the mineral fair in the main hall of BRUNO in Brunn am Gebirge. Collectors and dealers display and sell their finds, while regional mineral societies introduce their work. Exhibitions, a children’s creative station, ongoing guided tours, gem-cutting demonstrations and gemstone identification round out the visit. Tours are announced at the venue. The fair opens on Saturday 21 and Sunday 22 November, from 10 am to 5 pm on both days. Admission is free. It is organised by Kalliope, an association promoting science and science communication, with mineralogist Dr Robert Krickl coordinating the event. BRUNO is about a five-minute walk from Brunn-Maria Enzersdorf railway station.