naa a22 4500 510736262 CHVBK 20180411083011.0 cr unu---uuuuu 180411e20131201xx s 000 0 eng 10.1134/S1075701513070064 doi (NATIONALLICENCE)springer-10.1134/S1075701513070064 Osumilite-(Mg): Validation as a mineral species and new data [Elektronische Daten] [N. Chukanov, I. Pekov, R. Rastsvetaeva, S. Aksenov, D. Belakovskiy, K. Van, W. Schüller, B. Ternes] Osumilite-(Mg), the Mg-dominant analogue of osumilite, has been approved by the CNMNC IMA as a new mineral species. The holotype sample has been found at Bellerberg, Eifel volcanic area, Germany. Fluorophlogopite, sanidine, cordierite, mullite, sillimanite, topaz, pseudobrookite and hematite are associated minerals. Osumilite-(Mg) occurs as short prismatic or thick tabular hexagonal crystals reaching 0.5 × 1 mm in size in the cavities in basaltic volcanic glasses at their contact with thermally metamorphosed xenoliths of pelitic rocks. The mineral is brittle, with Mohs' hardness 6.5. Cleavage was not observed. Color is blue to brown. D meas = 2.59(1), D calc = 2.595 g/cm3. No bands corresponding to H2O and OH-groups are in the IR spectrum. Osumilite-(Mg) is uniaxial (+), ω = 1.539(2), ɛ = 1.547(2). The chemical composition (electron microprobe, average of 5 point analyses, wt %) is: 0.08 Na2O, 3.41 K2O, 0.04 CaO, 7.98 MgO, 0.28 MnO, 21.57 Al2O3, 3.59 Fe2O3, 62.33 SiO2, total 99.28. The empirical formula is: (K0.72Na0.03Ca0.01)(Mg1.97Mn0.04)[Al4.21Fe 0.45 3+ Si10.32]O30. The simplified formula is: KMg2Al3(Al2Si10)O10. The crystal structure was refined on a single crystal, R = 0.0294. Osumilite-(Mg) is hexagonal, space group P6/mcc; a = 10.0959(1), c = 14.3282(2)Å, V = 1264.79(6) Å3, Z = 2. The strongest reflections in the X-ray powder diffraction pattern [d, Å I %) (hkl)] are: 7.21 (37) (002), 5.064 (85) (110), 4.137 (45) (112), 3.736 (43) (202), 3.234 (100) (211), 2.932 (42) (114), 2.767 (51) (204). A type specimen is deposited in the Fersman Mineralogical Museum, Russian Academy of Sciences, Moscow, registration number 4174/1. Pleiades Publishing, Ltd., 2013 Chukanov N. Institute of Problems of Chemical Physics, Russian Academy of Sciences, 142432, Chernogolovka, Moscow oblast, Russia aut Pekov I. Faculty of Geology, Moscow State University, 119991, Moscow, Russia aut Rastsvetaeva R. Institute of Crystallography, Russian Academy of Sciences, Leninskii pr. 59, 117333, Moscow, Russia aut Aksenov S. Institute of Crystallography, Russian Academy of Sciences, Leninskii pr. 59, 117333, Moscow, Russia aut Belakovskiy D. Fersman Mineralogical Museum, Russian Academy of Sciences, Leninskii pr. 18-2, 117071, Moscow, Russia aut Van K. Institute of Experimental Mineralogy, Russian Academy of Sciences, 142432, Chernogolovka, Moscow oblast, Russia aut Schüller W. Straussenpesch 22, 53518, Adenau, Germany aut Ternes B. Bahnhofstrasse 45, 56727, Mayen, Germany aut Geology of Ore Deposits Springer US; http://www.springer-ny.com 55/7(2013-12-01), 587-593 1075-7015 55:7<587 2013 55 11477 https://doi.org/10.1134/S1075701513070064 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1134/S1075701513070064 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Chukanov N. Institute of Problems of Chemical Physics, Russian Academy of Sciences, 142432, Chernogolovka, Moscow oblast, Russia aut NATIONALLICENCE 700 1- Pekov I. Faculty of Geology, Moscow State University, 119991, Moscow, Russia aut NATIONALLICENCE 700 1- Rastsvetaeva R. Institute of Crystallography, Russian Academy of Sciences, Leninskii pr. 59, 117333, Moscow, Russia aut NATIONALLICENCE 700 1- Aksenov S. Institute of Crystallography, Russian Academy of Sciences, Leninskii pr. 59, 117333, Moscow, Russia aut NATIONALLICENCE 700 1- Belakovskiy D. Fersman Mineralogical Museum, Russian Academy of Sciences, Leninskii pr. 18-2, 117071, Moscow, Russia aut NATIONALLICENCE 700 1- Van K. Institute of Experimental Mineralogy, Russian Academy of Sciences, 142432, Chernogolovka, Moscow oblast, Russia aut NATIONALLICENCE 700 1- Schüller W. Straussenpesch 22, 53518, Adenau, Germany aut NATIONALLICENCE 700 1- Ternes B. Bahnhofstrasse 45, 56727, Mayen, Germany aut NATIONALLICENCE 773 0- Geology of Ore Deposits Springer US; http://www.springer-ny.com 55/7(2013-12-01), 587-593 1075-7015 55:7<587 2013 55 11477 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer