"UM1990-78-SiO:CaClFeHKNaZr" formula

There's an error in the formula of UM1990-78 mineral, recently added to the database. There is an error in the formula, however: the oxonium ion and alkaline metals cannot be written at the end of the formula. Their structural sites are said to be placed at the beginning of the formula as is correct also within the general rules for the crystallochemical formulas.

Thus, the correct one would be:

(H₃O)₂(Na,K)₅(Ca,Sr,Mn)₆Zr₃[Si[sub]3[/sub]O₇(O,OH)₂]₂[Si[sub]9[/sub]O₂₃(O,OH)₄]₂[SiNaFe(Zr,Ti,Al,Nb)[]]Cl_1,5(O,OH)

Thanks!

Luke K.

Thanks, Lukasz.
My only excuse is that it's a bloody eudialyte! And there are more to come!