Mckelveyite group minerals – Part 1: Nomenclature and new data on donnayite-(Y)
| Autor: | I. Lykova, R. Rowe, G. Poirier, G. Giester, K. Ojaste, H. Friis |
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| Jazyk: | angličtina |
| Rok vydání: | 2023 |
| Předmět: | |
| Zdroj: | European Journal of Mineralogy, Vol 35, Pp 133-142 (2023) |
| Druh dokumentu: | article |
| ISSN: | 0935-1221 1617-4011 |
| DOI: | 10.5194/ejm-35-133-2023 |
| Popis: | The mckelveyite group consisting of seven carbonate minerals – mckelveyite-(Y), ewaldite, weloganite, donnayite-(Y), alicewilsonite-(YCe), alicewilsonite-(YLa), and bainbridgeite-(YCe) – is formally established. The general formula of the minerals is A3B3(CO3)6 ⋅ 3H2O, where A= Na, Ca, Y, and Zr and B= Sr, Ba, Ce, and La. Different order–disorder modifications are known resulting in triclinic, monoclinic, hexagonal, and trigonal minerals with essentially the same structure. Re-examination of donnayite-(Y) type specimens shows that the original description contains data collected on two different species: donnayite-(Y) and alicewilsonite-(YCe). Donnayite-(Y), NaCaSr3Y(CO3)6 ⋅ 3H2O, was found in only one specimen out of seven – CMNMC 39396 – housed at the Canadian Museum of Nature, Ottawa. This specimen becomes the holotype of donnayite-(Y). The crystal structure of donnayite-(Y) was solved and refined to R1= 0.055 for 3366 reflections with I>2σ(I). Donnayite-(Y) is shown to have a weloganite-type structure confirming its place in the mckelveyite group. |
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