The crystal structures of potassium-exchanged forms of catapleiite and hilairite of the compositions (K0.49Ca0.42Na0.26) ZrSi3O9 · 2[(H2O)0.8(H3O)0.2] and K0.51ZrSi3O9 · [(H2O)0.5K0.27(H3O)0.23], respectively, were studied by X-ray diffraction and IR spectroscopy. Both structures retain the heteropolyhedral frameworks of the parent minerals formed by Zr octahedra and Si tetrahedra. The K cations occupy different positions in these minerals. In K-exchanged catapleiite, K cations are located only in the position occupied by Na in the structure of the parent mineral. In the K-exchanged form of hilairite, K cations are not only involved in the Na position but also partially occupy the H2O position.
|Autori interni:||MERLINO, STEFANO|
|Autori:||ZUBKOVA NV; PEKOV IV; TURCHKOVA AG; PUSHCHAROVSKY DY; MERLINO S; PASERO M; CHUKANOV NV|
|Titolo:||Crystal structures of potassium-exchanged forms of catapleite and hilairite|
|Anno del prodotto:||2007|
|Digital Object Identifier (DOI):||10.1134/S1063774507010075|
|Appare nelle tipologie:||1.1 Articolo in rivista|