LiNa(SO)·6HO: a lithium double salt causing trouble in the industrial conversion of LiSO into LiOH.

Lithium tris-odium bis-(sulfate) hexa-hydrate, LiNa(SO)·6HO was crystallized from aqueous solution at 298 K and the structure solved at different temperatures between 90 and 293 K. The structure is isomorphic with the corresponding molybdate and selenate double salt hydrate. It belongs to the non-centrosymmetric trigonal space group 3 (161).

Crystallization of metastable monoclinic carnallite, KCl·MgCl·6HO: missing structural link in the carnallite family.

During evaporation of natural and synthetic K-Mg-Cl brines, the formation of almost square plate-like crystals of potassium carnallite (potassium chloride magnesium dichloride hexahydrate) was observed. A single-crystal structure analysis revealed a monoclinic cell [a = 9.251 (2), b = 9.

Water channel structure of bassanite at high air humidity: crystal structure of CaSO4·0.625H2O.

Structure analysis using single-crystal diffraction was carried out as a contribution to the dispute about the nature of the water channel structure of bassanite (CaSO(4)·0.5H(2)O). A recent result of Weiss & Bräu (2009) for the crystal structure of bassanite (monoclinic, space group C2) at ambient conditions of air humidity was confirmed.

CaSeO4·0.625H2O--water channel occupation in a bassanite related structure.

Calcium selenate subhydrate, CaSeO(4)·0.625H(2)O, was prepared by hydrothermal conversion of CaSeO(4)·2H(2)O at 463 K. From the single crystals obtained in the shape of hexagonal needles, 50-300 µm in length, the crystal structure could be solved in a trigonal unit cell with space group P3(2)21.