naa a22 4500 51073622X CHVBK 20180411083011.0 cr unu---uuuuu 180411e20131201xx s 000 0 eng 10.1134/S107570151307009X doi (NATIONALLICENCE)springer-10.1134/S107570151307009X Vigrishinite, Zn2Ti4 − x Si4O14(OH,H2O,□)8, a new mineral from the Lovozero alkaline complex, Kola Peninsula, Russia [Elektronische Daten] [I. Pekov, S. Britvin, N. Zubkova, N. Chukanov, I. Bryzgalov, I. Lykova, D. Belakovskiy, D. Pushcharovsky] A new mineral vigrishinite, epistolite-group member and first layer titanosilicate with species-defining Zn, was found at Mt. Malyi Punkaruaiv, in the Lovozero alkaline complex, Kola Peninsula, Russia. It occurs in a hydrothermally altered peralkaline pegmatite and is associated with microcline, ussingite, aegirine, analcime, gmelinite-Na, and chabazite-Ca. Vigrishinite forms rectangular or irregularly shaped lamellae up to 0.05 × 2 × 3 cm flattened on [001]. They are typically slightly split and show blocky character. The mineral is translucent to transparent and pale pink, yellowish-pinkish or colorless. The luster is vitreous. The Mohs' hardness is 2.5-3. Vigrishinite is brittle. Cleavage is {001} perfect. D meas = 3.03(2), D calc = 2.97 g/cm3. The mineral is optically biaxial (−), α = 1.755(5), β = 1.82(1), γ = 1.835(8), 2V meas = 45(10)°, 2V calc = 50°. IR spectrum is given. The chemical composition (wt %; average of 9 point analyses, H2O is determined by modified Penfield method) is as follows: 0.98 Na2O, 0.30 K2O, 0.56 CaO, 0.05 SrO, 0.44 BaO, 0.36 MgO, 2.09 MnO, 14.39 ZnO, 2.00 Fe2O3, 0.36 Al2O3, 32.29 SiO2, 29.14 TiO2, 2.08 ZrO2, 7.34 Nb2O5, 0.46 F, 9.1 H2O, −0.19 O=F2, total is 101.75. The empirical formula calculated on the basis of Si + Al = 4 is: H7.42(Zn1.30Na0.23Mn0.22Ca0.07Mg0.07K0.05Ba0.02)Σ1.96(Ti2.68Nb0.41Fe 0.18 3+ Zr0.12)Σ3.39(Si3.95Al0.05)Σ4 20.31F0.18. The simplified formula is: Zn2Ti4−x Si4O14(OH,H2O,□)8 (x < 1). Vigrishinite is triclinic, space group P $\bar 1$ , a = 8.743(9), b = 8.698(9), c = 11.581(11)Å, α = 91.54(8)°, β = 98.29(8)°, γ = 105.65(8)°, V = 837.2(1.5) Å3, Z = 2. The strongest reflections in the X-ray powder pattern (d, Å, −I[hkl]) are: 11.7-67[001], 8.27-50[100], 6.94-43[0 $\bar 1$ 1, $\bar 1$ 10], 5.73-54[1 $\bar 1$ 1, 002], 4.17-65[020, $\bar 1$ $\bar 1$ 2, 200], and 2.861-100[3 $\bar 1$ 0, 2 $\bar 2$ 2, 004, 1 $\bar 3$ 1]. The crystal structure model was obtained on a single crystal, R = 0.171. Vigrishinite and murmanite are close in the structure of the TiSiO motif, but strongly differ from each other in part of large cations and H-bearing groups. Vigrishinite is named in honor of Viktor G. Grishin (b. 1953), a Russian amateur mineralogist and mineral collector, to pay tribute to his contribution to the mineralogy of the Lovozero Complex. The type specimen is deposited in the Fersman Mineralogical Museum of Russian Academy of Sciences, Moscow. Pleiades Publishing, Ltd., 2013 Pekov I. Faculty of Geology, Moscow State University, 119991, Moscow, Russia aut Britvin S. St. Petersburg State University, Universitetskaya nab. 7/9, 199034, St. Petersburg, Russia aut Zubkova N. Faculty of Geology, Moscow State University, 119991, Moscow, Russia aut Chukanov N. Institute of Problems of Chemical Physics, Russian Academy of Sciences, 142432, Chernogolovka, Moscow Region, Russia aut Bryzgalov I. Faculty of Geology, Moscow State University, 119991, Moscow, Russia aut Lykova I. Faculty of Geology, Moscow State University, 119991, Moscow, Russia aut Belakovskiy D. Fersman Mineralogical Museum, Russian Academy of Sciences, Leninsky pr. 18-2, 119071, Moscow, Russia aut Pushcharovsky D. Faculty of Geology, Moscow State University, 119991, Moscow, Russia aut Geology of Ore Deposits Springer US; http://www.springer-ny.com 55/7(2013-12-01), 575-586 1075-7015 55:7<575 2013 55 11477 https://doi.org/10.1134/S107570151307009X text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1134/S107570151307009X text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Pekov I. Faculty of Geology, Moscow State University, 119991, Moscow, Russia aut NATIONALLICENCE 700 1- Britvin S. St. Petersburg State University, Universitetskaya nab. 7/9, 199034, St. Petersburg, Russia aut NATIONALLICENCE 700 1- Zubkova N. Faculty of Geology, Moscow State University, 119991, Moscow, Russia aut NATIONALLICENCE 700 1- Chukanov N. Institute of Problems of Chemical Physics, Russian Academy of Sciences, 142432, Chernogolovka, Moscow Region, Russia aut NATIONALLICENCE 700 1- Bryzgalov I. Faculty of Geology, Moscow State University, 119991, Moscow, Russia aut NATIONALLICENCE 700 1- Lykova I. Faculty of Geology, Moscow State University, 119991, Moscow, Russia aut NATIONALLICENCE 700 1- Belakovskiy D. Fersman Mineralogical Museum, Russian Academy of Sciences, Leninsky pr. 18-2, 119071, Moscow, Russia aut NATIONALLICENCE 700 1- Pushcharovsky D. Faculty of Geology, Moscow State University, 119991, Moscow, Russia aut NATIONALLICENCE 773 0- Geology of Ore Deposits Springer US; http://www.springer-ny.com 55/7(2013-12-01), 575-586 1075-7015 55:7<575 2013 55 11477 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer