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The paper describes a previously unknown isomorphic series between thomsonite-Ca and a hypothetical Mg-rich zeolite. The Mg-rich thomsonite-Ca was found for the frst time in hydrothermal veins of the Lekkhoyla chromite occurrence (Polar Urals, Russia). The mineral contains up to 6.5 wt. % MgO (up to 1.35 f.u. Mg, O = 20) and exhibits a continuous isomorphism between Mg2+ and Na+ and Ca2+. The formula of the Mg-richest thomsonite-Ca is Na0.37Mg1.35Ca1.59Si5.18 Al4.35O20 ? 6(?)H2O (O = 20). The Raman spectra of thomsonite-Ca and Mg-rich thomsonite-Ca are similar both showing no bands typical of other minerals.Figures 7. Tables 2. References 12.

Mg-rich thomsonite-Ca from chromitites of the Lekkhoyla occurrence, Voykar-Syn’ya massif, Polar Urals