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https://hdl.handle.net/2440/65147
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Type: | Journal article |
Title: | Coulsellite, CaNa3AlMg3F14, a rhombohedral pyrochlore with 1:3 ordering in both A and B sites, from the Cleveland Mine, Tasmania, Australia |
Author: | Mumme, W. Grey, I. Birch, W. Pring, A. Bougerol, C. Wilson, N. |
Citation: | American Mineralogist: an international journal of earth and planetary materials, 2010; 95(5-6):736-740 |
Publisher: | Mineralogical Soc Amer |
Issue Date: | 2010 |
ISSN: | 0003-004X |
Statement of Responsibility: | W. Gus Mumme, Ian E. Grey, William D. Birch, Allan Pring, Catherine Bougerol and Nicholas C. Wilson |
Abstract: | Coulsellite, CaNa3AlMg3F14, from the Cleveland tin mine at Luina, western Tasmania, has a rhombohedral distortion of the cubic pyrochlore A2B2X6Y structure, with a = 7.1756(1) Å, α = 59.867(1)°, space group R3̄m, Z = 1. The corresponding hexagonal cell parameters are a = 7.1620(1) Å, c = 17.5972(3) Å. The crystals are multiply twinned about threefold axes of the pseudocubic cell. The structure was determined using X-ray data collected on a twinned crystal and refined to Robs = 0.027 for 452 observed reflections with I > 2σ(I). The structure is possibly unique among published structures of pyrochlore-like minerals in having full 1:3 ordering of Ca:Na in the A sites and Al:Mg in the B sites. Transmission electron photomicrographs show a nanodomain structure due to twinning on a scale of ∼5 nm. |
Keywords: | Rhombohedral pyrochlore new fluoride mineral structure determination 1:3 cation ordering in CaNa3AlMg3F14 |
Rights: | © 2010 Mineralogical Society of America |
DOI: | 10.2138/am.2010.3360 |
Published version: | http://dx.doi.org/10.2138/am.2010.3360 |
Appears in Collections: | Aurora harvest Earth and Environmental Sciences publications |
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