 | | Journal (article/letter/editorial) | | Universität Münster, Correnstr. 24, 48149 Münster, Germany *Corresponding author, e-mail: psb@uni-muenster...reaction 3 MgAlPO4O ⇔ farringtonite + berlinite + corundum was bracketed up to 1373 K and 1 GPa in an internally...relations with lazulite, berlinite, farringtonite, corundum and H2O. As MgAlPO4O was reported to undergo several...Stuttgart 160 P. Schmid-Beurmann, F. Brunet, V. Kahlenberg, E. Dachs The present study focuses on the properties...H2O. Lazulite coexists with berlinite (AlPO4), corundum, farringtonite, Mg3(PO4)2, and MgAlPO4O. The reaction |  | | Journal (article/letter/editorial) | | Accepted: 20 June 2018 © Springer-Verlag GmbH Germany, part of Springer Nature 2018 Abstract In-situ...that the dehydration reaction from diaspore to corundum occurs between 703 and 733 K. The in-situ single-crystal...Löffler and Mader 2003). Diaspore is transformed to corundum (α-Al2O3) at high temperatures by dehydration...dehydration the hcp O sub-lattices in both diaspore and corundum undergo a topotactic transformation, despite removal...as a function of temperature. Reflections from corundum first appeared at 733 K. High‑temperature single‑crystal |  | | Journal (article/letter/editorial) | | of coordination polyhedra for aluminum VOLKER KAHLENBERG,1,2,* REINHARD X. FISCHER,1 AND CLIFF S.J. SHAW3...Bremen, Klagenfurter Strasse, D-28359 Bremen, Germany 2 Department of Geosciences, State University of...Geoinstitut, Universität Bayreuth, D-95440 Bayreuth, Germany ABSTRACT The crystal structure of tetracalcium...were of the order of 75 °C per second. 1492 KAHLENBERG ET AL.: HIGH PRESSURE Ca4Al6O13 1493 Single-crystal...tet, bipr*, oct tet Mondal and Jeffery (1975) Kahlenberg et al. (2000) Bartl and Scheller (1970) Vincent |  | | Journal (article/letter/editorial) | | Development, Philipp-Reis-Str. 8, D-61273 Wehrheim/Ts., Germany 2 Institut für Mineralogie und Petrographie, Leopold...(Kristallographie), Klagenfurter Straße, D-28359 Bremen, Germany Abstract: A series of sulfate-phosphate apatite...Verlagsbuchhandlung, D-70176 Stuttgart 280 A. Piotrowski, V. Kahlenberg, R.X. Fischer Fig. 1. SEM photograph of the...mixtures were pressed into pellets and heated in open corundum crucibles between 500 and 800°C for 12 to 72 h...c=6.886(3) 0.7 – 0.6 – 282 A. Piotrowski, V. Kahlenberg, R.X. Fischer Fig. 5. Whole-pattern profile |  | | Journal (article/letter/editorial) | | (Kristallographie), Geowissenschaften D-28359Bremen,Germany UniversitiitBremen,KlagenfurterStrasse, '?Institut...Johannes-Gutenberg-Universituit Mainz,D-55099Mainz,Germany AssrRAcr The crystal structure of a synthetic NaAlSiOo...ordered distribution of the Na-cat- 631 632 KAHLENBERG AND BOHM: STRUCTURE OF HEXAGONAL TRINEPHELINE...minimize Na loss. Standardsused were albite for Na, corundum for Al, and wollastonite for Si; no other elements...Twinning and especially twinning by merohedry are KAHLENBERG AND BOHM: STRUCTURE OF HEXAGONAL TRINEPHELINE |  | Ma, C., Kampf, A. R., Connolly, H. C., Beckett, J. R., Rossman, G. R., Smith, S. A. S., Schrader, D. L. (2011) Krotite, CaAl2O4, a new refractory mineral from the NWA 1934 meteorite. American Mineralogist, 96 (5) 709-715 doi:10.2138/am.2011.3693 | Journal (article/letter/editorial) | | coordinates of synthetic low-pressure CaAl2O4 (Kahlenberg 2001) were used as the starting point. Structure...CaAl2O4 phase (Hörkner and MüllerBuschbaum 1976; Kahlenberg 2001). It consists of a tetrahedral framework...Ca2+ size and the topology of the UDUDUD rings (Kahlenberg 2001; Tait et al. 2010). At this time, krotite...Upon cooling, melilite, perovskite, and possibly corundum and mayenite crystallized interstitial to the...have appeared much as it does now except that corundum and mayenite may have been present and Cl-mayenite |  | | Report (issue) | | hornfels. Association: Hematite, hibonite, spinel, corundum, pseudobrookite. Distribution: From ~300 m northeast...In corundum from pyroclastic rocks at Mount Carmel, north Israel. Name: Honors Volker Kahlenberg (b. |  | | Journal (article/letter/editorial) | | Na7.85Al7.85Si8.15O32 Predrag Vulić,* Volker Kahlenberg, and Jürgen Konzett Institute for Mineralogy...given. The structure of hexagonal trinepheline (Kahlenberg and Böhm 1998) is also built up of elliptical...Natural jadeite, natural quartz, and synthetic corundum were chosen as standards with measurement times...observed for Na4 atom in hexagonal trinepheline (Kahlenberg and Böhm 1998) situated in the pseudo hexagonal...observed in the hexagonal trinepheline model (Kahlenberg and Böhm 1998). This sequence is further transformed |  | Schmidmair, Daniela, Kahlenberg, Volker, Dorn, Tobias, Perfler, Lukas, Tribus, Martina (2016) Crystal structure, Raman spectroscopy and crystal chemistry of K7Ca9[Si2O7]4F, a new potassium-calcium silicate-fluoride. European Journal of Mineralogy, 28 (4) 751-763 doi:10.1127/ejm/2016/0028-2539 | Journal (article/letter/editorial) | | silicate-fluoride DANIELA SCHMIDMAIR*, VOLKER KAHLENBERG, TOBIAS DORN, LUKAS PERFLER and MARTINA TRIBUS...are known (Kahlenberg et al., 2006; Arroyabe et al., 2009a, b and c; Arroyabe & Kahlenberg, 2011; Arroyabe...performed as described above. They were fired in open corundum combustion boats with a heating ramp of 120˚C/h...previously known compound K2Ca2Si2O7 (Arroyabe & Kahlenberg, 2011). To maintain electroneutrality, the incorporation...conforms to this symmetry are K2Ca2Si2O7 (Arroyabe & Kahlenberg, 2011), Na3LuSi2O7 (Tamazyan et al., 1988), Na3YSi2O7 |  | | Journal (article/letter/editorial) | | Balić-Žunić & Louise Josefine Belmonte & Volker Kahlenberg Received: 24 September 2010 / Accepted: 10 December...available to authorized users. P. Vulić : V. Kahlenberg Institute of Mineralogy and Petrography, University...measured. The standards were: albite (Si and Na), corundum (Al), K-feldspar (K), hematite (Fe), wollastonite...29:305–306 Belmonte LJ, Balić-Žunić T, Vulić P, Kahlenberg V. Ordering of Si and Al in the crystal structure...and Cie GmbH (2005) X-Area program. Darmstadt, Germany Dollase WA, Peacor DR (1971) Si–Al ordering in |  | Kechid, Sid-Ali, Parodi, Gian Carlo, Pont, Sylvain, Oberti, Roberta (2017) Davidsmithite, (Ca,□)2Na6Al8Si8O32: a new, Ca-bearing nepheline-group mineral from the Western Gneiss Region, Norway. European Journal of Mineralogy, 29 (6) 1005-1013 doi:10.1127/ejm/2017/0029-2667 | Journal (article/letter/editorial) | | staurolite, magnetite, rutile, ilmenite, hematite, corundum, Al–F-rich titanite, apatite, zircon, late zeolitic...preiswerkite þ albitic plagioclase, corundum þ albitic plagioclase, all except corundum being rich in both Na and...00–0.01 0.00–0.08 Wollastonite Orthoclase Albite Corundum Hematite Wollastonite Forsterite Rhodonite Ni-oxide...the “type sample” thin section G201b7. oo f Kahlenberg & Böhm (1998) showed that Trn (space group...P61, a = 9.995, c = 24.797 A; calculated from Kahlenberg & Böhm (1998). 440 441 442 443 444 445 446 |  | | Journal (article/letter/editorial) | | und Geophysik, Ruhr-Universität, D-44780 Bochum, Germany e-mail: werner.schreyer@ruhr-uni-bochum.de Abstract:...minerals such as white micas, Al-silicates, or even corundum. An impressive example for this distribution is...is provided by an extremely Al-rich corundum-rock from an Archaean Greenstone Belt in Zimbabwe (Schreyer...contains tourmaline coexisting exclusively with corundum and rutile. Nevertheless, this tourmaline is essentially...a starting material of the ideal composition, Kahlenberg & VeliÏckov (2000) report a total content of |  | | Journal (article/letter/editorial) | | high-temperature ceramic cement, to a 1.0 mm diameter corundum tube. Finally, the assembly was fixed and aligned...thermal expansion tensor using TEV (Langreiter & Kahlenberg, 2014). The dependence of the a and c parameters...Washington, DC, Vol. 2, 29–44. Langreiter, T. & Kahlenberg, V. (2014): TEV – a program for the determination...powder diffraction data. Bruker AXS, Karlsruhe, Germany. Bultosa, G. & Mulokozi, A.M. (1995): Kinetics |  | | Book (volume) | | (Specord 75 IR or Specord M80, Carl Zeiss, Jena, Germany), Perkin Elmer 1600 Series FT IR spectrometer or...FT IR spectrometer (Bruker Optics, Ettlingen, Germany). IR spectrum of a pure KBr disc was subtracted...Mg3B7O13Cl Locality: Wandsleben, Saxony-Anhalt, Germany. Description: White to beige fine-grained aggregate...Lüneburger Kalkberg, Lüneburg, Lower Saxony, Germany (type locality). Description: White fibrous aggregate...Niedersachswerfen, Nordhausen, Harz, Thuringia, Germany. Description: White crystals on anhydrite. Investigated |  | | Journal (article/letter/editorial) | | Geologie, Mineralogie und Geophysik, D-44780 Bochum, Germany Thermochemistry Facility, Department of Chemical...atmosphere (90 mL/min) (Navrotsky et al. 1994). Corundum, a-Al2O3, used for the calibration (Alfa Aesar...composition (Table 3). In samples K8 and K14, corundum and clinochlore, Mg5Al2Si3O10(OH)8, are additional...additional minor constituents, K6 contains only corundum as an impurity, and K3 contains a significant amount...08 2.51 (TG 400) H 4.69 Impurities traces of corundum and clinochlore K6 11 SiO2 Al2O3 MgO H 2O Sum |  | Kulik, Eleonora, Murzin, Vadim, Kawaguchi, Shogo, Nishiyama, Norimasa, Katsura, Tomoo (2018) Thermal expansion of coesite determined by synchrotron powder X-ray diffraction. Physics and Chemistry of Minerals, 45 (9) 873-881 doi:10.1007/s00269-018-0969-7 | Journal (article/letter/editorial) | | Accepted: 20 April 2018 © Springer-Verlag GmbH Germany, part of Springer Nature 2018 Abstract Thermal...Hamburg, Germany 2 Bayerisches Geoinstitut, University of Bayreuth, 95440 Bayreuth, Germany 3 Japan...installed at Deutsches Elektronen-Synchrotron (DESY), Germany. The second stage anvils were tungsten carbide...was ground into a fine powder of coesite using a corundum mortar and a pestle. The powder was loaded into...using the TEV V1.0.1. program (Langreiter and Kahlenberg 2015) by following the method described by Paufler |  | | Journal (article/letter/editorial) | | Materials Physics, TU Dresden, 01069 Dresden, Germany 3 Chemistry and Physics of Materials, Division...(Colville and Geller 1971, 1972; Geller et al. 1973; Kahlenberg and Fischer 2000). In a detailed investigation...issue was investigated in detail by Kruger and Kahlenberg (2005), Kruger et al. (2009, 2011), and Lazic...series has not been documented in the literature. Kahlenberg and Fischer (2000) investigated a G a 3+ -substituted...specific arrangement of Pt tubes fixed in larger corundum crucibles is shown in the ESI, Fig. S6. Electron |  | | Journal (article/letter/editorial) | | Greece Zn5(OH)8Cl2·H2O Richelsdorf slags, Hesse, Germany Pb3O3Sb3+(OH)Cl2 Lavrion District slag localities...(Ashley and Lottermoser 1999) Baden-Württemberg, Germany (type) (Klaproth 1804) Ramsbeckite (Cu,Zn)15(SO4)4(OH)22·6H2O...Zn)15(SO4)4(OH)22·6H2O Bastenberg mine, Ramsbeck, ? Germany (type) (von Hodenberg et al. 1985) Schulenbergite... Harz, OK Platosa mine, Bermejillo, Durango, Germany (type) (von Hodenberg et al. 1984) Mexico (Moore...Goslarite ZnSO4·7H2O Rammelsberg mine, Goslar, Germany (type) OK (Palache et al. 1951) Kornelite Fe23+(SO4)3·7H2O |  | | Journal (article/letter/editorial) | | end member brownmillerite phase (CaAlO2.5) (Kahlenberg et al. 2000). The Ca(Al0.5Si0.5)O2.75 composition...(88.0 wt%) with 10.2 wt% grossular and 1.8 wt% corundum (Al2O3). These samples are summarized in Table...of 12 nA and a beam diameter of 3 μm. Quartz, corundum and wollastonite were used as standards for Si...Ca3Al2Si3O12 grossular, lar Ca2SiO4 larnite, cor Al2O3 corundum, m minor amount, t trace amount a Unknown phases... cristobalite, coesite and stishovite, Al2O3 corundum, Ca2SiO4 larnite and C a3Al2Si3O12 grossular |  | Hatert, Frédéric, Pasero, Marco, Perchiazzi, Natale, Theye, Thomas (2007) Pumpellyite-(Al), a new mineral from Bertrix, Belgian Ardennes. European Journal of Mineralogy, 19 (2) 247-253 doi:10.1127/0935-1221/2007/0019-1720 | Journal (article/letter/editorial) | | Stuttgart, Azenbergstraße 18, 70174 Stuttgart, Germany Abstract: Pumpellyite-(Al), ideally Ca2(Al,Fe2+...Mineralogie und Kristallchemie, Universität Stuttgart, Germany) operated in the wavelength-dispersion mode, with...following standards were used: wollastonite (Si, Ca), corundum (Al), periclase (Mg), hematite (Fe), rhodonite...Acknowledgements: Many thanks are due to A.-M. Fransolet, V. Kahlenberg, C. Hejny and U. Kolitsch for their de- tailed |  | | Journal (article/letter/editorial) | | plagioclase + biotite after phengite and sapphirine + corundum + spinel + anorthite after kyanite. Polycrystalline...in these eclogites: kyanite, Mg-staurolite and corundum (Janák et al., 2015b). The investigated samples...fayalite (Fe), periclase (Mg), pyrophanite (Mn, Ti), corundum (Al), wollastonite (Ca and Si), eskolaite (Cr)...Chromium-rich kyanite, magnesiostaurolite and corundum in ultrahigh-pressure eclogites (examples from...Koch-Müller, M., Abs-Wurmbach, I., Rhede, D., Kahlenberg, V., Matsyuk, S. (2007): Dehydration experiments |  | Haefeker, Udo, Kaindl, Reinhard, Tropper, Peter, Krüger, Hannes, Kahlenberg, Volker, Orlova, Maria (2014) Structural investigations of the two polymorphs of synthetic Fe-cordierite and Raman spectroscopy of hexagonal Fe-cordierite. Mineralogy and Petrology, 108 (4) 469-478 doi:10.1007/s00710-013-0313-3 | Journal (article/letter/editorial) | | Kaindl & Peter Tropper & Hannes Krüger & Volker Kahlenberg & Maria Orlova Received: 11 June 2013 / Accepted:...U. Haefeker (*) : P. Tropper : H. Krüger : V. Kahlenberg : M. Orlova Institute of Mineralogy and Petrography...(standardized element in parenthesis): jadeite (Na), corundum (Al), almandine (Fe) and orthoclase (Si). The...metapelites of the Bayerische Wald (Variscan belt, Germany). Eur J Mineral 12:987–998 Khomenko VM, Langer |  | | Journal (article/letter/editorial) | | PAPER Spectroscopic study of inclusions in gem corundum from Mercaderes, Cauca, Colombia Manuela Zeug1...Springerlink.com Abstract Mineral inclusions in gem corundum from Mercaderes, Cauca, Colombia, were investigated...zircon inclusions and their neighbouring host corundum are affected by compressive stress, which is assigned...inclusions averages ~1.1 GPa. Heat treatment of corundum leads to structural reconstitution of zircon (narrowed...and accompanying stress release in the adjacent corundum (indicated by downshifts of the R1 emission of |  | | Journal (article/letter/editorial) | | Fernando Càmara (University of Turin), Volker Kahlenberg (University of Innsbruck), Marco Merlini and...Mineralogist, 96, 1363–1372. Gatta, G.D., Lotti, P., Kahlenberg, V., and Haefeker, U. (2012a) The low-temperature...147–152. Gatta, G.D., Lotti, P., Nénert, G., and Kahlenberg, V. (2013a) On the crystal structure and low-temperature...Materials, 185, 137–148. Gatta, G.D., Lotti, P., and Kahlenberg, V. (2013b) The low-temperature behavior of balliranoite... G.E., and Bender, W. (2013) A study of ruby (corundum) composition from the Mogok Belt, Myanmar: searching |  | | Journal (article/letter/editorial) | | P. Gado, Budapest, Hungary H. Goebel, Munchen, Germany R. Jenkins, Newtown Square, Pennsylvania G. G....Foschini Crystal structure of BaBi 2 Ta 2 0 9 V. Kahlenberg, M. Wendschuh-Josties, R. X. Fischer, H. Bauer...Diffraktionstechnik GmbH Sommerstrasse 4 D-83253 Rimstmg Germany Tel +49 (0) 80 51 - 68 78 - 0 Fax +49 (0) 80 51...Foil • Choice of grinding elements (agate or corundum) V High Purity Target Material V Beryllium Vacuum |
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