Lintisite is a new titanosilicate with ideal chemical composition Na3LiTi2Si4O14.2H2O, found at Lovozero, Kola peninsula, USSR. The mineral is monoclinic, space group C2/c, with a = 28.583(4), b = 8.600(1), c = 5.219(1) angstrom, beta = 91.03(2)-degrees. The crystal structure of lintisite has been refined to R = 0.033, Rw = 0.028 for 1095 reflections collected with Mo K-alpha radiation. The structure is formed by pyroxene-like chains of [SiO4] tetrahedra, chains of edge-sharing [TiO6] and [Na(O,H2O)6] octahedra, columns of edge-sharing [LiO4] tetrahedra, and distorted [NaO8] cubes. The modular relationships among lintisite, vinogradovite and ramsayite are discussed. Finally the thermal behaviour of lintisite is explained in the light of the structural results.
The crystal structure of lintisite, Na3LiTi[Si2O6]2O2·2H2O, a new titanosilicate from Lovozero (USSR)
MERLINO, STEFANO;PASERO, MARCO;
1990
Abstract
Lintisite is a new titanosilicate with ideal chemical composition Na3LiTi2Si4O14.2H2O, found at Lovozero, Kola peninsula, USSR. The mineral is monoclinic, space group C2/c, with a = 28.583(4), b = 8.600(1), c = 5.219(1) angstrom, beta = 91.03(2)-degrees. The crystal structure of lintisite has been refined to R = 0.033, Rw = 0.028 for 1095 reflections collected with Mo K-alpha radiation. The structure is formed by pyroxene-like chains of [SiO4] tetrahedra, chains of edge-sharing [TiO6] and [Na(O,H2O)6] octahedra, columns of edge-sharing [LiO4] tetrahedra, and distorted [NaO8] cubes. The modular relationships among lintisite, vinogradovite and ramsayite are discussed. Finally the thermal behaviour of lintisite is explained in the light of the structural results.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
