A former miner from Velenje was so passionate about his field of work that he amassed a collection of minerals from around the world numbering 912, with more than 2700 exhibits. Jože Rihtar had started at an even younger age, while still a school boy, and went on to acquire such examples as the Japanese rainbow carbuncle and extraordinary pieces from nearby (amber from Velenje, quartz crystal from Hrastnik near Škofja Loka). Located in the old town, closed Mondays.