 Utö and the surrounding islands are unique from a geological point of view and attract many people all-year round.Holmquistite is a kind of mineral that, in Sweden, can be found only on Utö and that is extremely rare globally with small occurrences in several countries in South America and Africa as well as in China, Australia, the USA and parts of Europe.It and many other kinds of minerals and stones are displayed at Utö Gruvmuseum, open daily in summertime in the afternoons.