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Mineralogical ClassificationIlyukhinite = IMA 2015-065
3rd Aug 2016 09:21 UTCKnut Edvard Larsen Manager
Abstract:
A new mineral ilyukhinite, ideally (H3O,Na)14Ca6Mn2Zr3Si26O72(OH)2 • 3H2O, has been found in a peralkaline pegmatite at the Mount Kukisvumchorr, Khibiny alkaline massif, Kola Peninsula, Russia. It occurs as brownish-orange, with vitreous luster, anhedral grains up to 1 mm across in a hydrothermally altered peralkaline rock, in association with aegirine, murmanite, albite, microcline, rhabdophane-(Ce), fluorite, sphalerite and molybdenite. Mohs' hardness is 5; cleavage is not observed. Dmeas 2.67(2), Dcalc 2.703 g/cm3. Ilyukhinite is optically uniaxial (-): ω = 1.585(2), ε = 1.584(2). IR spectrum is given. The chemical composition of ilyukhinite (wt %; electron microprobe, ranges are given in parentheses; H2O determined by gas chromatography) is: Na2O 3.07 (3.63-4.43), K2O 0.32 (0.28-0.52), CaO 10.63 (10.26-10.90), MnO 3.06 (2.74-3.22), FeO 1.15 (0.93-1.37), La2O3 0.79 (0.51-0.89), Ce2O3 1.21 (0.97-1.44), Nd2O3 0.41 (0.30-0.56), TiO2 0.90 (0.77-1.12), ZrO2 10.94 (10.15-11.21), Nb2O5 1.40 (0.76-1.68), SiO2 51.24 (49.98-52.28), SO3 1.14 (0.89-1.37), Cl 0.27 (0.19-0.38), H2O 10.9(5), -O = C1 -0.06, total 98.27. The empirical formula is: H36.04(Na3.82K0.20)(Ca5.65Ce0.22La0.14Nd0.07)(Mn1.285Fe0.48)(Zr2.645Ti0.34)Nb0.31Si25.41S0.42Cl0.23O86.82. The crystal structure is solved (R= 0.046). Ilyukhinite is trigonal, R3m; а = 14.1695(6) Å, с = 31.026(1) Å, V= 5394.7(7) Å3, Z = 3. The strongest reflections of the powder X-ray diffraction pattern [d, Å (I, %) (hlk)] are: 11.44 (82) (101), 7.09 (70) (110), 6.02 (44) (021), 4.371 (89) (205), 3.805 (47) (303, 033), 3.376 (41) (131), 2.985 (100) (315, 128), 2.852 (92) (404). Ilyukhinite was named in memory of the outstanding Russian crystallographer Vladimir V. Ilyukhin (1934-1982). Type specimen is deposited in collections of the Geological Museum, Natural History Museum, University of Oslo, Norway.
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Copyright © mindat.org and the Hudson Institute of Mineralogy 1993-2024, except where stated. Most political location boundaries are © OpenStreetMap contributors. Mindat.org relies on the contributions of thousands of members and supporters. Founded in 2000 by Jolyon Ralph.
Privacy Policy - Terms & Conditions - Contact Us / DMCA issues - Report a bug/vulnerability Current server date and time: May 13, 2024 20:34:55