Home / Explore / Minerals / Dacostaite Minerals Dacostaite dacostaite K(Mg2Al)[Mg(H2O)6]2(AsO4)2F6·2H2O Dacostaite: Mineral information, data and localities. — via www.mindat.org · Source Overview Dacostaite is a mineral species. It crystallises in the monoclinic system. Nickel–Strunz class: 8.DG.. Scientific references Dacostaite — Wikidata. https://www.wikidata.org/wiki/Q129511969 Link