Wiklundite is a rare and complex arsenate arsenite-silicate mineral with the chemical formula . The mineral characterizes in a large c unit cell parameter.Cooper, M.A., Hawthorne, F.C., Langhof, J., Hålenius, U., and Holtstam, D., 2015. Wiklundite, IMA 2015-057. CNMNC Newsletter No. 27, October 2015, 1227; Mineralogical Magazine 79, 1229–1236 It was found in Långban, Sweden - a home for many rare and exotic minerals.
Relation to other minerals Structure of wiklundite is unique. A slightly chemically similar mineral, although lacking manganese and iron, is hereroite.
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