Magnesium Periodates

Langlois obtained small prismatic crystals of magnesium dimesoperiodate, Mg₂I₂O₉, with 12 molecules of water, by dissolving magnesium carbonate in periodic acid. A residue of the trihydrate remained after heating the crystals to 100° C.

Rammelsberg obtained the metaperiodate, Mg(IO₄)₂.10H₂O, from the mother-liquor.

Rammelsberg also described some other periodates.