Английская Википедия:Ellsworthite
Шаблон:Short description Шаблон:Orphan
Uranpyrochlore (of Hogarth 1977), also known as ellsworthite or betafite Шаблон:Chem2, is a rare earth mineral mostly found in the northern parts of North America. It is a uranpyrochlore and is named after Hardy V. Ellsworth of the Canadian Geological Survey by Walker and Parsons.[1] It is a very uranium- and thorium- rich mineral, which in fact makes it slightly radioactive. Uranium makes up about 17.1% of the mineral.[2] Ellsworthite is also known as the mineral Betafite. Ellsworthite is a thorium-bearing mineral that is found mostly in Canada and Alaska. It was first discovered in Hybla, Ontario, which is now a ghost town.[3]
Composition
Ellsworthite has complex hydrous oxides of niobium, tantalum, sodium, calcium, with hydroxyl and fluorine; it may contain as much as 17% uranium.[4][5][6]
Structure
The structure of ellsworthite is cubic and has a point group of 4/m 3* 2/m. It is part of the isometric system and has the space group Fd3m. It forms into a Hexoctahedral with {110}, {100}, {113}, {233}, and {230}.[5]
Sources
- Bulletin of the National Research Council, Number 77, Physics of the Earth - I Volcanology, By the Subsidiary Committee on Volcanology, Published by the National Research Council of The National Academy of Sciences Washington, D.C., (1931)
- ↑ T. L. Walker and A. L. Parsons (1923) Ellsworthite and associated minerals from Hybla, Ontario. Contrib. Canad. Min., 1923, Univ. Toronto Stud., Geol. Ser., 16, 13-20
- ↑ Frondel, J.W., Fleischer, M. (1950) A Glossary of Uranium-and Thorium-Bearing minerals. Geological Survey Circular 74, pg.11, http://babel.hathitrust.org/cgi/pt?id=uc1.32106020887797;view=1up;seq=1
- ↑ Ошибка цитирования Неверный тег
<ref>; для сносокFrodelне указан текст - ↑ Bates, R.G., Wedow Jr, H. (1953). Preliminary summary review of Thorium-Bearing mineral occurrence in Alaska. Geological Survey bulletin 202
- ↑ 5,0 5,1 Ошибка цитирования Неверный тег
<ref>; для сносокhandbookне указан текст - ↑ Hogarth D.D. (1961) A study of Pyrochlore and Betafite, volume 6, issue 5. Canadian Mineralogist pg.610
- Английская Википедия
- Oxide minerals
- Uranium minerals
- Niobium minerals
- Tantalum minerals
- Titanium minerals
- Calcium minerals
- Thorium minerals
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