Tancaite-(Ce) is a very rare molybdate mineral with the formula FeCe(MoO4)3•3H2O. It was found in Punta de Su Seinargiu locality on Sardinia, Italy.Orlandi, P., and Bonaccorsi, E., 2010. Tancaite-(Ce), IMA 2009-097. CNMNC Newsletter, April 2010, 376; Mineralogical Magazine 74, 375-377 Red crystals of tancaite-(Ce) resemble modified cubes, but the mineral is trigonal (space group R-3). The type locality of tancaite-(Ce) is also a place of discovery of other molybdate minerals, including thorium molybdates ichnusaite and nuragheite.
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