 | | 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...Although structural similarities with respect to tridymite derivatives can be found, hexagonal trinepheline...trinepheline representsa new type of stuffed tridymite that is not a simple superstructureof nepheline. INrnonucrron...stuffed derivative of the SiO, modification of high-tridymite. A slight difference between the natural nephelines |  | Tait, K. T., Yang, H., Downs, R. T., Li, C., Pinch, W. W. (2010) The crystal structure of esperite, with a revised chemical formula, PbCa2(ZnSiO4)3, isostructural with beryllonite. American Mineralogist, 95 (5) 699-705 doi:10.2138/am.2010.3415 | Journal (article/letter/editorial) | | stuffed derivative of tridymite. Materials belonging to the large family of tridymite derivatives have been...(Hörkner and Müller-Buschbaum 1976), CaAl1.8Fe0.2O4 (Kahlenberg 2001), AgXPO4 (X = Be, Zn) (Hammond et al. 1998)...wR2 = 4.41 R1 = 3.07 and wR2 = 4.61 1.001 In tridymite and its stuffed derivatives, corner-sharing of...Taylor (1983, 1984)]. Various derivatives of tridymite differ chiefly in the stacking of tetrahedral...the configurations of six-membered rings. In tridymite, nepheline, and kalsilite, there is only one type |  | Ferraris, Cristiano, Parodi, Gian Carlo, Pont, Sylvain, Rondeau, Benjamin, Lorand, Jean-Pierre (2014) Trinepheline and fabriesite: two new mineral species from the jadeite deposit of Tawmaw (Myanmar) European Journal of Mineralogy, 26 (2) 257-265 doi:10.1127/0935-1221/2014/0026-2348 | Journal (article/letter/editorial) | | 1974; Yamada et al., 1983; Selker et al., 1985; Kahlenberg & Böhm, 1998; Vulić et al., 2008, 2013). Fabriesite...measured for NHI. For synthetic trinepheline, Kahlenberg & Böhm (1998) do not report optical data; the...9.995 Å, c ¼ 24.797 Å, Z ¼ 24; ICSD 85553 - Kahlenberg & Böhm, 1998). All the other tested structures...al., 1983 – ICSD 46008; Selker et al., 1985; Kahlenberg & Böhm, 1998; Vulić et al., 2008, 2013) were...for CuKa radiation were calculated with data of Kahlenberg & Böhm (1998) and are listed in Table 3. The |  | | Journal (article/letter/editorial) | | building units (Meier et al., 1996) connected in a tridymite type topology (Buerger et al., 1954). The nepheline...derivative (Buerger, 1954) modification of high-tridymite, where half of the Si4þ cations are replaced by...Verlagsbuchhandlung, D-70176 Stuttgart 474 P. Vulić, V. Kahlenberg, C. Gspan, R. Dimitrijević receiving slits...hexagonal symmetry was synthesized and described by Kahlenberg & Böhm (1998). Dimitrijević et al. (2004) reported...carnegieite, because the Rietveld refinement with Kahlenberg & Böhm’s hexagonal trinepheline model – which |  | | Journal (article/letter/editorial) | | monoclinic trinepheline Predrag Vulić and Volker Kahlenberg With 4 figures and 8 tables Abstract. The crystal...noticed and attributed to a transition into a tridymite like structure. Furthermore, the presence of a...Schweizerbart’sche Verlagsbuchhandlung, Stuttgart, Germany DOI: 10.1127/0077-7757/2012/0219 www.schweizerbart...0077-7757/2012/0219 $ 2.50 198 P. Vulić and V. Kahlenberg Experimental methods Synthesis and determination...framework structure. The fur- 200 P. Vulić and V. Kahlenberg Fig. 3. Crystal structure of the novel hexagonal |  | | Journal (article/letter/editorial) | | Na7.85Al7.85Si8.15O32 Predrag Vulić,* Volker Kahlenberg, and Jürgen Konzett Institute for Mineralogy...topology of the new compound corresponds to that of tridymite. The coordination sequences are identical for...be described as a stuffed derivative of high-tridymite where half of the silicon ions are replaced by...attribute it to a transformation into a high-tridymite-like structure. Dimitrijević et al. (2004) established...given. The structure of hexagonal trinepheline (Kahlenberg and Böhm 1998) is also built up of elliptical |  | 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) | | β = 90.188(6), and Z = 12. It has a stuffed tridymite structure, which was refined from single-crystal...coordinates of synthetic low-pressure CaAl2O4 (Kahlenberg 2001) were used as the starting point. Structure...MüllerBuschbaum 1976; Kahlenberg 2001). It consists of a tetrahedral framework similar to that of tridymite (SiO2),...and P is [2Fc2 + Max(Fo2,0)]/3. to as “stuffed tridymite” structures (Buerger 1954; Glasser and Glasser...six-membered rings. Different derivatives of the tridymite structure are obtained through variations in the |  | | Journal (article/letter/editorial) | | Universität Münster, Correnstr. 24, 48149 Münster, Germany *Corresponding author, e-mail: psb@uni-muenster...Stuttgart 160 P. Schmid-Beurmann, F. Brunet, V. Kahlenberg, E. Dachs The present study focuses on the properties...MgAlPO4O was synthesised from mixtures of AlPO4 (tridymite form) and MgO pressed to pellets and heated at...study, the product consisted mainly of AlPO4-tridymite with small amounts AlPO4-cristobalite (Debnath...0.99 162 P. Schmid-Beurmann, F. Brunet, V. Kahlenberg, E. Dachs Table 2. Data collection and single-crystal |  | Gatta, G. D., Rotiroti, N., Zanazzi, P.F., Rieder, M., Drabek, M., Weiss, Z., Klaska, R. (2008) Synthesis and crystal structure of the feldspathoid CsAlSiO4: An open-framework silicate and potential nuclear waste disposal phase. American Mineralogist, 93 (7) 988-995 doi:10.2138/am.2008.2729 | Journal (article/letter/editorial) | | Czech Republic 6 HeidelbergCement AG, Ennigerloh, Germany 1 Abstract Crystalline CsAlSiO4 was synthesized...known as reviewed by Baur and Fischer (2000) and Kahlenberg et al. (2001). Hahn et al. (1969) and Liebau...rings as building block units (i.e., stuffed-tridymite structures, like nepheline and kalsilite). For...framework (i.e., ABW framework type) and that of tridymite, which represents the framework type of some important...configuration in tridymite and ABW type compounds are shown in Figure 5. In tridymite (or stuffed-tridymite structures) |  | Schmidmair, Daniela, Kahlenberg, Volker, Többens, Daniel M., Schottenberger, Herwig, Jochem De Wit, , Griesser, Ulrich J. (2015) Temperature- and moisture-dependent powder X-ray diffraction studies of kanemite (NaSi2O4(OH)·3H2O) Mineralogical Magazine, 79 (1) 103-120 doi:10.1180/minmag.2015.079.1.09 | Journal (article/letter/editorial) | | Crystallography, Hahn-Meitner-Platz 1, D-14109 Berlin, Germany Institute of General, Inorganic and Theoretical...is based on the d-form of sodium disilicate (Kahlenberg et al., 1999). In this context, ‘builder’ denotes...‘SKS-10’ material, provided kindly by Clariant, Germany, was used, although it contains a minor amount...following crystalline compounds: cristobalite, tridymite and b- and d-Na 2 Si 2 O 5 . Quantification of...The simultaneous occurrence of cristobalite and tridymite in a temperature regime where b-quartz should |  | Mikhailova, Julia A., Aksenov, Sergey M., Pakhomovsky, Yakov A., Moine, Bertrand N., Dusséaux, Camille, Vaitieva, Yulia A., Voronin, Mikhail (2022) Iron in Nepheline: Crystal Chemical Features and Petrological Applications. Minerals, 12 (10) 1257 doi:10.3390/min12101257 | Journal (article/letter/editorial) | | Al. The entry of a smaller Na cation into the tridymite framework causes a reduction in size and change...tetrahedra, which leads to the doubling of the tridymite-type unit cell and the appearance of four crystallographically...microscope LEO-1450 (Carl Zeiss Microscopy, Oberkochen, Germany) with the energy-dispersive system Aztec Ultimmax...characterized by a tetrahedral framework of a tridymite-type topology with the presence of wide channels...hexagonal rings in cross-section. The symmetry of the tridymite-type framework (the aristotype)isischaracterized |  | 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) | | in at%, projected from the □8Si16O32 apex of tridymite (cf. Fig. 1b in Rossi et al., 1989) such that...the “type sample” thin section G201b7. oo f Kahlenberg & Böhm (1998) showed that Trn (space group...16SiO2 ¼ ðNa; KÞ8 Al8 Si24 O64 ; feldspathoid þ tridymite=quartz ¼ feldspar: eschweizerbart_xxx 428 429...P61, a = 9.995, c = 24.797 A; calculated from Kahlenberg & Böhm (1998). 440 441 442 443 444 445 446 ...Mineral., 29, doi:10.1127/ejm/2017/0029-2648. Kahlenberg, V. & Böhm, H. (1998): Crystal structure of hexagonal |  | | Journal (article/letter/editorial) | | = 14.32-15.53 %). Hippler and Böhm (1989) and Kahlenberg and Böhm (1998) overcame similar difficulties...twinning by merohedry, which is often encountered in tridymite derivatives. Consequently, we also took twinning...Canadian Mineralogist, 48, 69-80. Balassone, G., Kahlenberg, V., Altomare, A., Mormone, A., Rizzi, R., Saviano...structures. Acta Crystallographica. B24, 355-358. Kahlenberg, V. and Böhm, H. (1998) Crystal structure of... G.M. (1996) SADABS. University of Göttingen, Germany. Sheldrick, G.M. (2008) A short history of SHELX |  | | Journal (article/letter/editorial) | | Energie, Hahn-Meitner-Platz 1, D-14109 Berlin, Germany. 0003-004X/13/0001–197$05.00/DOI: http://dx.doi...the starting compound of CaAl2O4 with stuffed tridymite structure was kept at 15 GPa and 1873 K for 1...software, as described in the study by Többens and Kahlenberg (2011). The atom displacements used for the calculation...aluminates and similar compounds (Többens and Kahlenberg 2011), and it worked very well for MgAl2O4 and...calculations demonstrated in the study by Többens and Kahlenberg (2011). A full assignment of the spectrum, limited |  | | Journal (article/letter/editorial) | | Erlangen-Nürnberg, Schlossgarten 5a, 91054 Erlangen, Germany. thomas.angerer@uibk.ac.at 1 2 Despite the strong...Stilleweg 2, Hannover Germany; present address: Kiebitzweg, 104, 30880 Laatzen, Germany 3 Department of Lithospheric...Geowissenschaften und Rohstoffe (BGR, Hannover, Germany) carried out a reconnaissance survey of a hitherto...245(2) c = 26.824(3) Å, α = 90.00(1)°. HEJNY, C., KAHLENBERG, V., EBERHARD, T. & KRÜGER, H. (2016): Acta Crystallogr...University of Hannover,Callinstraße 3,30167 Hannover, Germany 3 Institute of Earth Sciences, Heidelberg University |  | | 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 |  | Iskrina, Anastasiia V., Spivak, Anna V., Bobrov, Andrey V., Eremin, Nikolai N., Marchenko, Ekaterina I., Dubrovinsky, Leonid S. (2020) Synthesis and crystal structures of new high-pressure phases CaAl2O4 and Ca2Al6O11. Lithos, 374. 105689pp. doi:10.1016/j.lithos.2020.105689 | Journal (article/letter/editorial) | | 119991 Jo ur University of Bayreuth, Bayreuth, Germany 95440 Corresponding Author: grigoryeva_av888@mail... 2002). Jo ur structure similar to that of tridymite. Ca3Al2O6 was not found in nature (Ivanova et...CaAl2O4 phase (CA-I) with a space group P21/n and a tridymite-type structure is stable under the normal conditions...T=1600°C at the Bayerisches Geoinstitut (Bayreuth, Germany). The starting material (CaAl2O4) was a 6 Journal...Chem. Minerals. 30, 409–415. ro Lazic, B., Kahlenberg, V., Konzett, J., Kaindl, R., 2006. On the polymorphism |  | Zhitova, Elena S., Khanin, Dmitry A., Nuzhdaev, Anton A., Nazarova, Maria A., Ismagilova, Rezeda M., Shilovskikh, Vladimir V., Kupchinenko, Anastasia N., Kuznetsov, Ruslan A., Zhegunov, Pavel S. (2022) Efflorescent Sulphates with M+ and M2+ Cations from Fumarole and Active Geothermal Fields of Mutnovsky Volcano (Kamchatka, Russia) Minerals, 12 (5) 600 doi:10.3390/min12050600 | Journal (article/letter/editorial) | | Opl—opal, S—native Sulphur, Kln—kaolinite, Trd—tridymite, Crs—crystoballite, Let—letovicite, Msk—mascagnite...letovicite is found in association with kaolinite and tridymite, and mascagnite is associated with gypsum. The...abundant SiO2 or SiO2 × nH2 O polymorphs: opal, tridymite, and cristobalite, all derived as the result of...silicate dioxide minerals: opal, cristobalite, and tridymite. The jarosite rim around shaped gypsum crystal...O2 , mascagnite-gypsum, letovicite-kaolinite-tridymite, and alum-voltaite-alunogen [55] Minerals 2022 |  | | Journal (article/letter/editorial) | | rock-forming framework silicates such as cristobalite, tridymite, nepheline, kalsilite, leucite, etc. Orthogonal...respectively. The algorithmic complexity of the tridymite tetrahedral framework is four, whereas its static...polymorphs can be described by the same relation: the tridymite topology is more complex than the quartz topology...Series, 43. Quebec, Canada. Krivovichev, S.V., Kahlenberg, V., Kaindl, R., Mersdorf, E., Tananaev, I.G...editors). Springer-Verlag, Berlin-Heidelberg, Germany. Morse, J.W. and Casey, W.H. (1988) Ostwald processes |  | Shannon, Ruth C., Lafuente, Barbara, Shannon, Robert D., Downs, Robert T., Fischer, Reinhard X. (2017) Refractive indices of minerals and synthetic compounds. American Mineralogist, 102 (9) 1906-1914 doi:10.2138/am-2017-6144 | Journal (article/letter/editorial) | | Center for Materials and Processes, D-28359 Bremen, Germany 1 2 Abstract This is a comprehensive compilation...Synthetic 1.5442 SiO2 stishovite Synthetic 1.799 SiO2 tridymite Plumas County, 1.478 California SiO2 SiO2-keatite...(OH)12∙6H2O Maroldsweisach, Franconia, Bavaria, Germany ThO2 Synthetic 2.105 2.105 2.105 2.105 2.078 1...3533 2.321 1.4 33.27 16.64 7.082 Larsen (1921) Germany Fe3+O(OH) goethite Restormel Royal 2.275 2.409...Australia cobalt-korignite Saxony, Erzgebirge, Germany Arsenates (Co0.68Zn0.24Cu0.02Fe0.01Ni0.01)S0.96AsO3OH∙H2O |  | | Journal (article/letter/editorial) | | et al. (1954), is a “stuffed” variation of the tridymite (SiO2) structure, where up to half of the Si4+...as these compositions lie in the SiO2 phase (tridymite/cristobalite/quartz), albite, sodium silicate...many stuffed derivatives of cristobalite and tridymite. This compositional space may be illustrated as...(Na8Al8Si8O32), kaliophilite/kalsilite (K8Al8Si8O32), and tridymite/cristobalite (o8Si16O32) (Rossi et al. 1989)....Na-nepheline/carnegieite, kaliophilite/kalsilite, and tridymite/cristobalite quaternary as described by Rossi |  | Balassone, Giuseppina, Kahlenberg, Volker, Altomare, Angela, Mormone, Angela, Rizzi, Rosanna, Saviano, Michele, Mondillo, Nicola (2014) Nephelines from the Somma-Vesuvius volcanic complex (Southern Italy): crystal-chemical, structural and genetic investigations. Mineralogy and Petrology, 108 (1) 71-90 doi:10.1007/s00710-013-0290-6 | Journal (article/letter/editorial) | | investigations Giuseppina Balassone & Volker Kahlenberg & Angela Altomare & Angela Mormone & Rosanna...80134 Naples, Italy e-mail: balasson@unina.it V. Kahlenberg Institut für Mineralogie und Petrographie, University...it can be considered a stuffed derivative of tridymite, with P63 space group symmetry and cell parameters...41:61–70 Vulić P, Balić-Žunić T, Belmonte LJ, Kahlenberg V (2011) Crystal chemistry of nephelines from |  | | Report (issue) | | Page. y Continued. 218 Modifications 220 Tridymite Occurrence 220 Modifications 220 221 Opal...recently the theory has been strongly attacked by Kahlenberg, who not only holds that the theory is unnecessary...and calcium. The aluminum and silica were Kahlenberg, L., The theory of electrolytic dissociation...dissociation: Jour. Phys. Chem., vol. 6, 1902, p. 1. c Kahlenberg, L., and Lincoln, A. T., Solutions of silicates...Mendeleeff, and have recently been strongly opposed by Kahlenberg. Certainly there are many discrepancies between |  | | Journal (article/letter/editorial) | | 2010; De La Pierre et al. 2011; Többens and Kahlenberg 1370 Vibrational calculations The calculation...minerals as in Whitney and Evans (2010): Trd = tridymite (SiO2); Crs = cristobalite (SiO2); Qz-b = quartz-b...America Bulletin, 84, 1335–1348. Többens, D.M., and Kahlenberg, V. (2011) Improved DFT calculation of Raman |  | Morrison, Shaunna M., Downs, Robert T., Blake, David F., Prabhu, Anirudh, Eleish, Ahmed, Vaniman, David T., Ming, Douglas W., Rampe, Elizabeth B., Hazen, Robert M., Achilles, Cherie N., Treiman, Allan H., Yen, Albert S., Morris, Richard V., Bristow, Thomas F., Chipera, Steve J., Sarrazin, Philippe C., Fendrich, Kim V., Morookian, John Michael, Farmer, Jack D., Des Marais, David J., Craig, Patricia I. (2018) Relationships between unit-cell parameters and composition for rock-forming minerals on Earth, Mars, and other extraterrestrial bodies. American Mineralogist, 103 (6) 848-856 doi:10.2138/am-2018-6123 | Journal (article/letter/editorial) | | Journal, 2, 51–59. Mills, S.J., Nestola, F., Kahlenberg, V., Christy, A.G., Hejny, C., and Redhammer...(2016) Silicic volcanism on Mars evidenced by tridymite in high-SiO2 sedimentary rock at Gale crater. |
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