IMA 2015-065 = ilyukhinite

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Marco E. Ciriotti
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Iscritto il: ven 25 giu, 2004 11:31
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IMA 2015-065 = ilyukhinite

Messaggio da Marco E. Ciriotti » gio 18 ago, 2016 11:40

Referenza:
▪ Chukanov, N.V., Rastsvetaeva, N.K., Rozenberg, K.A., Aksenov, S.M., Pekov, I.V., Belakovsky, D.I., Kristiansen, R., Van, K.V. (2016): Ilyukhinite, (H3O,Na)14Ca6Mn2Zr3Si26O72(OH)3•3H2O, a new mineral of the eudialyte group. Zapiski Rossiiskogo Mineralogicheskogo Obshchestva, 145(2), 44-58 (in Russian).

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.

PS: Parrebbe, ma - in realtà - non è l'analogo Mn-dominante dell'aqualite. È la ventisettesima specie del gruppo dell'eudialyte.
Marco E. Ciriotti

«Things are interesting only in so far as they relate themselves to other things»

Avatar utente
Marco E. Ciriotti
Messaggi: 24390
Iscritto il: ven 25 giu, 2004 11:31
Località: via San Pietro, 55 I-10073 Devesi/Cirié TO - Italy
Contatta:

Re: IMA 2015-065 = ilyukhinite

Messaggio da Marco E. Ciriotti » gio 15 mar, 2018 10:02

Referenza:
▪ Chukanov, N.V., Rastsvetaeva, R.K., Rozenberg, K.A., Aksenov, S.M., Pekov, I.V., Belakovsky, D.I., Kristiansen, R., Van, K.V. (2018): Ilyukhinite (H3O,Na)14Ca6Mn2Zr3Si26O72(OH)2⋅3H2O, a New Mineral of the Eudialyte Group. Geology of Ore Deposits, 59, 592-600.

Abstract:
A new eudialyte-group mineral, ilyukhinite, ideally (H3O,Na)14Ca6Mn2Zr3Si26O72(OH)2 · 3H2O, has been found in peralkaline pegmatite at Mt. Kukisvumchorr, Khibiny alkaline pluton, Kola Peninsula, Russia. It occurs as brownish orange, with vitreous luster anhedral grains up to 1 mm across in hydrothermally altered peralkaline rock, in association with aegirine, murmanite, albite, microcline, rhabdophane-(Ce), fluorite, sphalerite and molybdenite. The 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). The IR spectrum is given. The average chemical composition of ilyukhinite (wt %; electron microprobe, ranges given in parentheses; H2O determined by gas chromatography) is as follows: 3.07 (3.63–4.43) Na2О, 0.32 (0.28–0.52) K2O, 10.63 (10.26–10.90) CaO, 3.06 (2.74–3.22) MnO, 1.15 (0.93–1.37) FeO, 0.79 (0.51–0.89) La2O3, 1.21 (0.97–1.44) Ce2O3, 0.41 (0.30–0.56) Nd2O3, 0.90 (0.77–1.12) TiO2, 10.94 (10.15–11.21) ZrO2, 1.40 (0.76–1.68) Nb2O5, 51.24 (49.98–52.28) SiO2, 1.14 (0.89–1.37) SO3, 0.27 (0.19—0.38) Cl, 10.9(5 )H2O, –0.06 –O = C1, total is 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 has been solved (R = 0.046). Ilyukhinite is trigonal, R3m; a = 14.1695(6) Å, b = 31.026(1) Å, V = 5394.7(7) Å3, Z = 3. The strongest XRD reflections [d, Å (I, %) (hkl)] 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 Vladimir V. Ilyukhin (1934–1982), an outstanding Soviet crystallographer. The type specimen of ilyukhinite has been deposited in the collection of the Natural History Museum, University of Oslo, Norway.
Marco E. Ciriotti

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