 | | Journal (article/letter/editorial) | | Crystal chemistry of Xonotlite. Part I 153 N. Jb. Miner. Abh. 2009, Vol. 186/2, p. 153–162, Stuttgart...2009 Crystal chemistry of Xonotlite Ca6Si6O17(OH)2. Part I: Determination of polytypes using X-Ray Powder...and 5 tables Abstract: The crystal chemistry of xonotlite is mainly controlled by its four different polytypes...minor substitutions of Mn and Al. To determine the 4 ordered polytypes known for xonotlite (M2a2b2c, M2a2bc...patterns were calculated based on atom coordinates of Hejny & Armbruster (2001). For each polytype characteristic |  | Armbruster, T., Lazic, B., Galuskina, I. O., Galuskin, E. V., Gnos, E., Marzec, K. M., Gazeev, V. M. (2012) Trabzonite, Ca4[Si3O9(OH)]OH: crystal structure, revised formula, new occurrence and relation to killalaite. Mineralogical Magazine, 76 (3) 455-472 doi:10.1180/minmag.2012.076.3.02 | Journal (article/letter/editorial) | | Institute of Geological Sciences, University of Bern, Freiestr. 3, CH-3012 Bern, Switzerland Faculty of Earth...Sciences, Department of Geochemistry, Mineralogy and Petrography, University of Silesia, Be˛dzińska...Bobrzyńskiego 14, 30-348 Cracow, Poland Institute of Geology of Ore Deposits, Geochemistry, Mineralogy and Petrography...Editor: Andrew Christy] ABSTRACT The crystal structure of the rare skarn mineral trabzonite, Ca4[Si3O9(OH)]OH...which contains Si3O10 trimers embedded in a framework of CaO6 8 polyhedra, has orthorhombic symmetry, space |  | Buse, Ben, Schumacher, John C., Sparks, R. Stephen J., Field, Matthew (2010) Growth of bultfonteinite and hydrogarnet in metasomatized basalt xenoliths in the B/K9 kimberlite, Damtshaa, Botswana: insights into hydrothermal metamorphism in kimberlite pipes. Contributions to Mineralogy and Petrology, 160 (4) 533-550 doi:10.1007/s00410-010-0492-4 | Journal (article/letter/editorial) | | 10.1007/s00410-010-0492-4 ORIGINAL PAPER Growth of bultfonteinite and hydrogarnet in metasomatized basalt...volcaniclastic kimberlite of the B/K9 pipe, Damtshaa, Botswana, constrain conditions of kimberlite alteration...augite-plagioclase assemblage, driven by the serpentinisation of the kimberlite creating strong chemical potential...hydrogarnet are estimated to form at temperatures of ca. 350–250°C, which are similar to those for serpentinisation...efficiency of mass transfer and chemical reactions below the critical point of water and a consequence of volume-increasing |
|
