naa a22 4500 510736300 CHVBK 20180411083011.0 cr unu---uuuuu 180411e20131201xx s 000 0 eng 10.1134/S1075701513070106 doi (NATIONALLICENCE)springer-10.1134/S1075701513070106 Ferrotochilinite, 6FeS · 5Fe(OH)2, a new mineral from the Oktyabr'sky deposit, Noril'sk district, Siberia, Russia [Elektronische Daten] [I. Pekov, E. Sereda, Yu. Polekhovsky, S. Britvin, N. Chukanov, V. Yapaskurt, I. Bryzgalov] A new mineral, ferrotochilinite, ideally 6FeS · 5Fe(OH)2, was found at the Oktyabr'sky Mine, Oktyabr'skoe Cu-Ni deposit, Noril'sk, Krasnoyarsk krai, Siberia, Russia. It is associated with ferrovalleriite, magnetite and Fe-rich, chlorite-like phyllosilicate in the cavities of pentlandite-mooihoekite-cubanite ore with subordinate magnetite and chalcopyrite. Ferrotochilinite occurs as flattened on [001], prismatic to elongated lamellar crystals up to 0.1 × 0.5 × 3.2 mm, typically split and curved. Aggregates (up to 6.5 mm in size) are fanlike, rosette-like, or chaotic. Ferrotochilinite is dark bronze. The streak is black. The luster is moderately metallic. The Mohs' hardness is ca. 1; VHN is 13 kg/mm2. Cleavage is {001} perfect, micalike. Individuals are flexible, inelastic. D(calc) = 3.467 g/cm3. In reflected light, ferrotochilinite is gray, with the hue changing from pale beige to bluish; bireflectance is distinct. Anisotropy is distinct, with gray bluish to yellowish beige rotation colors. No internal reflections. Reflectance values [R min-R max, % (λ, nm)] are: 11.6-11.4 (470), 11.2-12.4 (546), 11.1-13.6 (589), 11.0-15.5 (650). The IR spectrum shows the presence of (OH) groups bonded with Fe cations and the absence of H2O molecules. Chemical composition (wt %; electron probe; H content is calculated) is as follows: 0.02 Mg, 61.92 Fe, 0.03 Ni, 0.09 Cu, 19.45 S, 16.3 O, 1.03 H calc; the total is 98.84. The empirical formula calculated on the basis of 6 S atoms is: Mg0.01Fe10.96Ni0.005Cu0.015S6(OH)10.07 = (Fe5.98Cu0.0015Ni0.005)Σ6S6(OH)9.80(Fe 4.89 2+ Mg0.01)Σ4.90(OH)9.80Fe 0.09 3+ (OH)0.27. Ferrotochilinite is monoclinic, space group is C2/m, Cm or C2, the unit-cell dimensions are: a = 5.463(5), b = 15.865(17), c = 10.825(12) Å, β = 93.7(1)°, V = 936(3) Å3, Z = 2. The strongest reflections in the X-ray powder diffraction pattern (d, Å-I[hkl]) are: 10.83-13[001], 5.392-100[002], 3.281-7[023], 2.777-7[150], 2.696-12[004, $$20\bar 1$$ ], 2.524-12[ $$22\bar 1$$ , $$20\bar 2$$ ], 2.152-8[134, 153], 1.837-11[135, $$17\bar 3$$ ]. Ferrotochilinite is a structural analog of tochilinite, with Fe2+ instead of Mg in the hydroxide part. The type specimen is deposited in 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 Sereda E. Noril'skgeologiya, PO Box 889, 663330, Talnakh, Noril'sk, Krasnoyarsk krai, 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 Yapaskurt V. Faculty of Geology, Moscow State University, 119991, Moscow, Russia aut Bryzgalov I. 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), 567-574 1075-7015 55:7<567 2013 55 11477 https://doi.org/10.1134/S1075701513070106 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1134/S1075701513070106 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- 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 700 1- Yapaskurt V. Faculty of Geology, Moscow State University, 119991, Moscow, Russia aut NATIONALLICENCE 700 1- Bryzgalov I. 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), 567-574 1075-7015 55:7<567 2013 55 11477 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer