Crystallization of metastable monoclinic carnallite, KCl·MgCl(2)·6H(2)O: 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 = 9.516 (2), c...

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Detalles Bibliográficos
Autores principales: Pannach, Melanie, Paschke, Iris, Schmidt, Horst, Freyer, Daniela, Voigt, Wolfgang
Formato: Online Artículo Texto
Lenguaje:English
Publicado: International Union of Crystallography 2020
Materias:
Research Papers
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7199198/
https://www.ncbi.nlm.nih.gov/pubmed/32367833
http://dx.doi.org/10.1107/S2053229620005197
Descripción
Sumario: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 = 9.516 (2), c = 13.217 (4) Å, β = 90.06 (2)° and space group C2/c]. The structure is isomorphous with other carnallite-type com­pounds, such as NH(4)Cl·MgCl(2)·6H(2)O. Until now, natural and synthetic carnallite, KCl·MgCl(2)·6H(2)O, was only known in its ortho­rhom­bic form [a = 16.0780 (3), b = 22.3850 (5), c = 9.5422 (2) Å and space group Pnna].

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