Can I read Kodamaite, Na3(Ca5Na)6Si16O36(OH)4F2·14− x H2O, x = ∼5, A New Layered Alkali-Alkaline Earth Fluorosilicate-Hydrate and Member of the Gyrolite Supergroup, from Mont Saint-Hilaire, Quebec, Canada: Description, Crystal-Chemical Considerations, and Genetic Implications on EtoBox?

Kodamaite, Na3(Ca5Na)6Si16O36(OH)4F2·14− x H2O, x = ∼5, A New Layered Alkali-Alkaline Earth Fluorosilicate-Hydrate and Member of the Gyrolite Supergroup, from Mont Saint-Hilaire, Quebec, Canada: Description, Crystal-Chemical Considerations, and Genetic Implications by Andrew M. McDonald; George Y. Chao is a Earth and Planetary Sciences article available to read on EtoBox.

What is Kodamaite, Na3(Ca5Na)6Si16O36(OH)4F2·14− x H2O, x = ∼5, A New Layered Alkali-Alkaline Earth Fluorosilicate-Hydrate and Member of the Gyrolite Supergroup, from Mont Saint-Hilaire, Quebec, Canada: Description, Crystal-Chemical Considerations, and Genetic Implications about?

## Abstract Kodamaite, ideally Na3(Ca5Na)6Si16O36(OH)4F2·14−xH2O, where x = ∼5, is a new mineral discovered at the Poudrette quarry, Mont Saint-Hilaire, Quebec, Canada. It develops in spherulitic aggregates up to ∼2 mm across, comprising thin, platy to bladed crystals, with individual crystals averaging 4σFo). Kodamaite has a strongly layered crystal structure, with a motif based on single sheets of SiO4 tetrahedra (T) that are composed of regular, planar, six-membered rings (with a u6 arrangement; apices of the tetrahedra all point in a common direction, up = u). The regular rings of tetrahedra are linked in the (001) plane by SiO3(OH) tetrahedra, whose apical directions are opposite to those in the ring (down; d). Linkages between the two types of tetrahedra give rise to an irregular, six-membered ring of tetrahedra with a u2du2d arrangement. The combination of regular and irregular six-membered rings of tetrahedra produces a three-connected (63)4 net. Two symmetry-related T layers, designated T2 and −T2, sandwich a closest-packed layer of edge-sharing Naφ6 and Caφ6 octahedra and Naφ8 polyhedra (φ = undefined ligand; O, F), forming a quasi-layer of octahedra (O). Refinement of

Who reads Kodamaite, Na3(Ca5Na)6Si16O36(OH)4F2·14− x H2O, x = ∼5, A New Layered Alkali-Alkaline Earth Fluorosilicate-Hydrate and Member of the Gyrolite Supergroup, from Mont Saint-Hilaire, Quebec, Canada: Description, Crystal-Chemical Considerations, and Genetic Implications?

Author

Andrew M. McDonald; George Y. Chao

Publisher

Mineralogical Association of Canada

Published

2024

Language

EN

Field

Earth and Planetary Sciences (Physical Sciences)