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LALONDEITE, A NEW HYDRATED Na–Ca FLUOROSILICATE SPECIES FROM MONT SAINT-HILAIRE, QUEBEC: DESCRIPTION AND CRYSTAL STRUCTURE

Andrew M. McDonald^1, and George Y. Chao^2,¶

¹ Mineral Exploration Centre and Department of Earth Sciences, Laurentian University, Sudbury, Ontario P3E 2C6, Canada
² Ottawa–Carleton Geoscience Centre, Department of Earth Sciences, Carleton University, Ottawa, Ontario K1S 5B6, Canada

View larger version (201K): [in this window] [in a new window]   FIG. 1. A. A sample of lalondeite with a clinoamphibole (greenish). The field of view is approximately 10 cm across (CMN #83717). B. Closeup of a vein of lalondeite; the field of view is approximately 3 cm across. Photographs by L. Horváth.

View larger version (18K): [in this window] [in a new window]   FIG. 2. Infrared spectrum of lalondeite.

View larger version (35K): [in this window] [in a new window]   FIG. 3. The OT2&Tmacr;2O module in lalondeite. The six-membered silicate rings (light green tetrahedra) are cross-linked by Si3O4 (orange) and Si6O4 (blue) tetrahedra. The closest-packed O layer is composed of NaO6 (purple) and CaO6 (blue) octahedra. The H2O molecules are shown as green spheres, and the disordered Na2a,b ions, as red spheres.