| 词条 | Bartelkeite |
| 释义 |
| name = Bartelkeite | category = Germanate mineral | image = | imagesize = | alt = | caption = | formula = PbFeGe(Ge2O7)(OH)2•H2O | strunz = 9.J0.10 (10 ed) 4/C.08-60 (8 ed) | dana = 7.6.2.1 | system = Monoclinic | class = Spheroidal (2) or prismatic (2/m) | symmetry = P21 or P21/m | unit cell = a = 5.83, b = 13.62, c = 6.31 [Å], β = 127.31° (approximated); Z = 2 | color = Colorless, white, very pale greenish | colour = | habit = tabular; acicular | twinning = | cleavage = {101}, distinct | fracture = | tenacity = | mohs = 4 | luster = Subadamantine | streak = White | diaphaneity = Transparent | gravity = | density = 4.97 | polish = | opticalprop = Biaxal (-) | refractive = nα=1.89, nβ=1.91, nγ=1.91 (approximated) | birefringence = | pleochroism = | 2V = ca. 35o (measured) | dispersion = | extinction = | length fast/slow = | fluorescence = | absorption = | melt = | fusibility = | diagnostic = | solubility = | impurities = | alteration = | other = | references = [1][1][3] }}Bartelkeite is an exceptionally rare mineral, one of scarce natural germanium compounds.[2] The formula was originally assumed to be PbFeGe3O8,[3] 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.[4] Bartelkeite and mathewrogersite are minerals with essential (dominant) lead, iron and germanium.[5] Both come from Tsumeb, Namibia - a world's "capital" of germanium minerals.[6] Occurrence and associationBartelkeite was detected in voids of germanium ore occurring within dolostones. The mineral associates with galena, germanite, reniérite, and tennantite.[1] Crystal structureBartelkeite 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:[4]
References1. ^1 {{cite web|url=http://www.handbookofmineralogy.org/pdfs/bartelkeite.pdf |title=Bartelkeite - Handbook of Mineralogy |website=Handbookofmineralogy.org |accessdate=2016-03-12}} {{mineral-stub}}2. ^1 {{cite web|url=http://www.mindat.org/min-541.html |title=Bartelkeite: Bartelkeite mineral information and data |website=Mindat.org |accessdate=2016-03-04}} 3. ^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) 4. ^1 2 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 5. ^{{cite web|url=http://www.mindat.org/min-2590.html |title=Mathewrogersite: Mathewrogersite mineral information and data |website=Mindat.org |accessdate=2016-03-04}} 6. ^{{cite web|url=http://www.mindat.org/loc-2428.html |title=Tsumeb Mine (Tsumcorp Mine), Tsumeb, Otjikoto Region (Oshikoto), Namibia - Mindat.org |website=Mindat.org |accessdate=2016-03-10}} 5 : Oxide minerals|Germanium minerals|Lead minerals|Iron minerals|Monoclinic minerals |
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