Английская Википедия:Bartelkeite
Шаблон:Infobox mineral Bartelkeite is an exceptionally rare mineral, one of scarce natural germanium compounds.[1] The formula was originally assumed to be PbFeGe3O8,[2] bartelkeite was later shown to be isostructural with a high-pressure form of the mineral lawsonite. Thus, its correct formula is PbFeGe(Ge2O7)(OH)2•H2O.[3] Bartelkeite and mathewrogersite are minerals with essential (dominant) lead, iron and germanium.[4] Both come from Tsumeb, Namibia - a world's "capital" of germanium minerals.[5]
Occurrence and association
Bartelkeite was detected in voids of germanium ore occurring within dolomites. The mineral associates with galena, germanite, reniérite, and tennantite.[6]
Crystal structure
Bartelkeite is the first analyzed mineral containing both tetrahedrally- and octahedrally-coordinated germanium. It is isostructural with high-pressure form of the silicate lawsonite. In the structure there are:[3]
- chains of FeO6 and GeO6 octahedra, that share edges
- Ge2O7 dimers that cross-link the chains
- Pb atoms and water molecules in large cavities of the framework
References
- ↑ Шаблон:Cite web
- ↑ Keller, V.P., Hess, H., and Dunn, P.J., 1981. Bartelkeit, PbFe2+Ge3O8, ein neues Germanium-Mineral von Tsumeb, Namibia. Chemie der Erde 40, 201-206 (in German)
- ↑ 3,0 3,1 Origlieri, M.J., Yang, H., Downs, R.T., Posner, E.S., Domanik, K.J., and Pinch, W.P., 2012. The crystal structure of bartelkeite, with a revised chemical formula, PbFeGeVI(Ge2IVO7)(OH)2·H2O, isotypic with high-pressure P21/m lawsonite. American Mineralogist 97(10), 1812-1815
- ↑ Шаблон:Cite web
- ↑ Шаблон:Cite web
- ↑ Ошибка цитирования Неверный тег
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- Английская Википедия
- Oxide minerals
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- Lead minerals
- Iron(II) minerals
- Monoclinic minerals
- Minerals in space group 4
- Minerals in space group 11
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