naa a22 4500 510736424 CHVBK 20180411083011.0 cr unu---uuuuu 180411e20131201xx s 000 0 eng 10.1134/S1075701513080102 doi (NATIONALLICENCE)springer-10.1134/S1075701513080102 Ferrovalleriite, 2(Fe,Cu)S · 1.5Fe(OH)2: Validation as a mineral species and new data [Elektronische Daten] [I. Pekov, E. Sereda, V. Yapaskurt, Yu. Polekhovsky, S. Britvin, N. Chukanov] Ferrovalleriite, ideally 2(Fe,Cu)S · 1.5Fe(OH)2, a layered hydroxide-sulfide of the valleriite group and an analog of valleriite with Fe instead of Mg in the hydroxide block, has been approved by the IMA Commission on New Minerals, Nomenclature and Classification as a valid mineral species. It was found in the Oktyabr'sky Mine, Noril'sk, Krasnoyarsk krai, Siberia, Russia. Ferrovalleriite occurs in cavities of massive sulfide ore mainly consisting of cubanite and mooihoekite. In different cases, it is associated with magnetite, Fe-rich chlorite-like phyllosilicate, ferrotochilinite, hibbingite, or rhodochrosite. Ferrovalleriite forms crystals flattened on [001] (from scaly to tabular; up to 5 mm across and up to 0.3 mm thick), typically split and curved. Occasionally, they are combined into aggregates up to 1.5 × 2 cm. Ferrovalleriite is dark bronze-colored, with a metallic luster and black streak. The Mohs' hardness is ca. 1; VHN is 35 kg/mm2. Cleavage is perfect parallel to {001}, mica-like. Individuals are flexible and inelastic. D(calc) = 3.72 g/cm3. In reflected light, ferrovalleriite is pleochroic from yellowish to gray; bireflectance is moderate. Anisotropy is strong, with bluish gray to yellowish beige rotation colors. Reflectance values [R 1-R 2 %, (λ, nm)] are: 15.6-16.6 (470), 14.8-20.5 (546), 14.7-22.3 (589), 14.5-24.1 (650). The IR spectrum shows the presence of (OH) groups bonded with Fe cations and the absence of H2O molecules. The chemical composition of the holotype (wt %; electron microprobe, H content is calculated) is as follows: 0.10 Al, 0.03 Mn, 45.31 Fe, 0.07 Ni, 18.29 Cu, 20.37 S, 15.62 O, 0.98 H, total is 100.77. The empirical formula calculated on the basis of 2 S atoms is: Al0.01Fe2.55Cu0.91S2(OH)3.07 = (Fe1.09Cu0.91)Σ2S2 · (Fe 1.34 2+ Fe 0.12 3+ Al0.01)Σ1.47(OH)3.07. The structure of ferrovalleriite is incommensurate (misfit); two sublattices are present: (1) sulfide sublattice, space group $$R\bar 3m$$ , R3m or R32; the unit-cell dimensions are: a = 3.792(2), c = 34.06(3) Å, V = 424(1) Å3 and (2) hydroxide sublattice, space group $$P\bar 3m1$$ , P3m1 or P321; the unit-cell dimensions: a = 3.202(3), c = 11.35(2)Å, V = 100.8(3) Å3. Together with this main polytype modification with three-layer (R-cell, Z = 3) sulfide block, the holotype ferrovalleriite contains the modification with one-layer (P-cell, Z = 1) sulfide block (sulfide sublattice with $$P\bar 3m1$$ , P3m1 or P321, unit cell dimensions: a = 3.789(4), c = 11.35(1) Å, V = 141(5) Å3). The strongest reflections in the X-ray powder pattern (d, Å-I) are: 5.69-100; 3.268-58; 3.163-36; 1.894-34; 1.871-45. Pleiades Publishing, Ltd., 2013 Pekov I. Faculty of Geology, Moscow State University, 119991, Moscow, Russia aut Sereda E. Noril'skgeologiya, PO Box 889, 663330, Talnakh, Noril'sk, Krasnoyarsk krai, Russia aut Yapaskurt V. Faculty of Geology, Moscow State University, 119991, Moscow, Russia aut Polekhovsky Yu St. Petersburg State University, Universitetskaya nab. 7/9, 199034, St. Petersburg, Russia aut Britvin S. St. Petersburg State University, Universitetskaya nab. 7/9, 199034, St. Petersburg, Russia aut Chukanov N. Institute of Problems of Chemical Physics, Russian Academy of Sciences, 142432, Chernogolovka, Moscow oblast, Russia aut Geology of Ore Deposits Springer US; http://www.springer-ny.com 55/8(2013-12-01), 637-647 1075-7015 55:8<637 2013 55 11477 https://doi.org/10.1134/S1075701513080102 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1134/S1075701513080102 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Pekov I. Faculty of Geology, Moscow State University, 119991, Moscow, Russia aut NATIONALLICENCE 700 1- Sereda E. Noril'skgeologiya, PO Box 889, 663330, Talnakh, Noril'sk, Krasnoyarsk krai, Russia aut NATIONALLICENCE 700 1- Yapaskurt V. Faculty of Geology, Moscow State University, 119991, Moscow, Russia aut NATIONALLICENCE 700 1- Polekhovsky Yu St. Petersburg State University, Universitetskaya nab. 7/9, 199034, St. Petersburg, Russia aut NATIONALLICENCE 700 1- Britvin S. St. Petersburg State University, Universitetskaya nab. 7/9, 199034, St. Petersburg, Russia aut NATIONALLICENCE 700 1- Chukanov N. Institute of Problems of Chemical Physics, Russian Academy of Sciences, 142432, Chernogolovka, Moscow oblast, Russia aut NATIONALLICENCE 773 0- Geology of Ore Deposits Springer US; http://www.springer-ny.com 55/8(2013-12-01), 637-647 1075-7015 55:8<637 2013 55 11477 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer