Gajardoite-(NH4), (NH4)As3+4O6Cl2[(Ca0.5□0.5)(H2O)5], a new mineral from the Khovu-Aksy deposit, Eastern Siberia, Russia
A.V. Kasatkin, V.V. Gurzhiy, N.V. Chukanov, A.A. Agakhanov, R. Škoda, D.I. Belakovskiy
УДК 549.73 (571.52) | https://doi.org/10.35597/2313-545X-2024-10-1-1 | Читать PDF (RUS) |
The new mineral gajardoite-(NH4), ideally (NH4)As3+4O6Cl2[(Ca0.5□0.5)(H2O)5], is found at the Khovu-Aksy Ni-Co deposit, Republic of Tyva, Russia. Gajardoite-(NH4) occurs as tiny lamellar coarsely hexagonal or irregular curved and divergent crystals up to 0.01 mm in size. The crystals are combined in groups, rosette-like clusters or spherulitic aggregates up to 0.2 mm, which are intimately intergrown with annabergite, arsenolite, and pharmacolite on a matrix of skutterudite, safforite, and other minerals. The new mineral is colorless, white in aggregates, transparent with a white streak and a vitreous lustre. It is brittle, with a perfect cleavage on {001}. The Mohs hardness is ~1½. The calculated density (Dcalc ) is 2.583 g/cm3.Gajardoite-(NH4) is optically non-pleochroic, uniaxial (–), ω = 1.745(10), ε = 1.558(5) (589 nm). The chemical composition determined by electron microprobe (wt. %, H2O content calculated by stoichiometry) is as follows: (NH4)2O 3.17, Na2O 0.40, K2O 1.07, CaO 5.28, As2O3 67.25, Cl 12.21, H2O 15.30, O=Cl –2.76, total 101.92. The empirical formula based on four As and 11 O atoms per formula unit is [(NH4)0.72K0.13Na0.08]Σ0.93Ca0.55As3+4O6Cl2.03(H2O)5. Gajardoite-(NH4) is hexagonal, space group P6/mmm; the unit-cell parameters are as follows: a = 5.263(3), c = 16.078(5) Å, V = 385.8(5) Å3, Z = 1. The strongest lines of the powder X-ray diffraction pattern [d, Å (I, %) (hkl)] include 16.08 (34) (001), 5.36 (34) (003), 4.565 (41) (100), 3.466 (23) (103), 2.637 (100) (110), 2.360 (25) (113). Gajardoite-(NH4) is an ammonium analog of gajardoite KCa0.5As3+4O6Cl2 • 5H2O. Their structural identity is confrmed by powder X-ray diffraction and infrared and Raman spectroscopy.
Keywords: gajardoite-(NH4), new mineral, chemical composition, powder X-ray diffraction, IR spectrum, Raman spectrum, gajardoite, Khovu-Aksy deposit, Eastern Siberia.
Received 07.01.2024, revised 26.01.2024, accepted 10.02.2024
A.V. Kasatkin, Fersman Mineralogical Museum RAS, Leninskiy pr. 18/2, Moscow, 119071 Russia; anatoly.kasatkin@gmail.com
V.V. Gurzhiy, Institute of Earth Sciences, St. Petersburg State University, Universitetskaya nab. 7/9, St. Petersburg, 199034 Russia;
N.V. Chukanov, Institute of Earth Sciences, St. Petersburg State University, Universitetskaya nab. 7/9, St. Petersburg, 199034 Russia;
A.A. Agakhanov, Fersman Mineralogical Museum RAS, Leninskiy pr. 18/2, Moscow, 119071 Russia;
R. Škoda, Masaryk University, Kotlářská 2, Brno, 611 37 Czech Republic;
D.I. Belakovskiy, Fersman Mineralogical Museum RAS, Leninskiy pr. 18/2, Moscow, 119071 Russia
- Bahfenne S. (2011) Single crystal Raman spectroscopy of selected arsenite, antimonite and hydroxyantimonate minerals (PhD dissertation). Queensland University of Technology, Brisbane.
- Basciano L.C., Peterson R.C. (2007) The crystal structure of ammoniojarosite, (NH4)Fe3(SO4)2(OH)6 and the crystal chemistry of the ammoniojarosite–hydronium jarosite solid-solution series. Mineralogical Magazine, 71 (4), 427– 441. https://doi.org/10.1180/minmag.2007.071.4.427
- Bogomol A.A. (1970) Features of the geological structure and localization of mineralization of the Khovu-Aksy Co deposit. Geologiya rudnykh mestorozhdeniy (Geology of Ore Deposits), 6, 30–45. (in Russian).
- Borisenko A.S., Lebedev V.I. (1982) Physicochemical formation conditions of ores of the Khovu-Aksy Co deposit. In: Gidrotermalnaya nizko-temperaturnaya mineralizatsiya i metasomatizm (Hydrothermal low-temperature mine¬ralization and metasomatism). Novosibirsk, Nauka, 142– 157. (in Russian).
- Borishanskaya S.S., Vinogradova R.A., Krutov G.A. (1981) Minerals of Ni and Co: systematics, description, identifcation. Moscow, MGU, 224 p. (in Russian)
- Britvin S.N., Dolivo-Dobrovolsky D.V., Krzhizhanovskaya M.G. (2017) Software for processing the X-ray powder diffraction data from a curved image plate detector of a Rigaku RAXIS Rapid II diffractometer. Zapiski Rossiiskogo Mineralogicheskogo Obshchestva (Proceedings of the Russian Mineralogical Society), 146, 104–107 (in Russian)
- Gagné O.C., Hawthorne F.C. (2015) Comprehensive derivation of bond-valence parameters for ion pairs involving oxygen. Acta Crystallographica, B71, 561–578. https://doi. org/10.1107/S2052520615016297
- Garavelli A., Mitolo D., Pinto D., Vurro F. (2013) Lucabindiite, (K,NH4)As4O6(Cl,Br), a new fumarole mineral from the “La Fossa” crater at Vulcano, Aeolian Islands, Italy. American Mineralogist, 98, 470–477. https://doi. org/10.2138/am.2013.4194
- García-Rodríguez L., Rute-Pérez A., Piñero J.R., González-Silgo, C. (2000) Bond-valence parameters for ammonium-anion interactions. Acta Crystallographica, B56, 565–569. https://doi.org/10.1107/S0108768100002615
- Gusev N.I. (2019) Peculiarities of magmatism of the Khovu-Aksy Ni-Co-As ore cluster (Tuva). In: Geologicheskaya struktura i mineraly Tsentral’noy Sibiri (Geological Structure and Minerals of Central Siberia). Moscow, Rosgeologiya, 22–29. (in Russian).
- Holland T.J.B., Redfern S.A.T. (1997) Unit cell refnement from powder diffraction data: the use of regression diagnostics. Mineralogical Magazine, 61, 65–77. https://doi. org/10.1180/minmag.1997.061.404.0
- Kampf A.R., Nash B.P., Dini M., Molina Donoso A.A. (2016) Gajardoite, KCa0.5As3+4O6Cl2 • 5H2O, a new mineral related to lucabindiite and torrecillasite from the Torrecillas mine, Iquique Province, Chile. Mineralogical Magazine, 80, 1265–1272. https://doi.org/10.1180/minmag.2016.080.065
- Kampf A.R., Chukanov N.V., Möhn G., Dini M., Molina Donoso A.A., Friis H. (2019) Cuatrocapaite-(NH4) and cuatrocapaite-(K), two new minerals from the Torrecillas mine, Iquique Province, Chile, related to lucabindiite and gajardoite. Mineralogical Magazine, 83, 741–748. https:// doi:10.1180/mgm.2019.26
- Kampf A., Nash B., Molina Donoso A. (2020) Mauriziodiniite, NH4(As2O3)2I, the ammonium and iodine analogue of lucabindiite from the Torrecillas mine, Iquique province, Chile. Mineralogical Magazine, 84, 267–273. https://doi.org/10.1180/mgm.2019.75
- Kasatkin A.V. (2021) New fndings of rare minerals from Russia. Part II. Mineralogical Almanac, 26 (2), 20–58.
- Kasatkin A.V., Gurzhiy V.V., Chukanov N.V., Agakhanov A.A., Škoda R., Belakovskiy D.I. (2024) Gajardoite-(NH4), IMA 2023-070. CNMNC Newsletter 76. Mineralogical Magazine, 88, https://doi.org/10.1180/ mgm.2023.89.
- Krutov G.A. (1978) Khovu-Aksy deposit. In: Rudnye mestorozhdeniya SSSR (Ore Deposits of the USSR). Moscow, Nedra, 2, 84–94 (in Russian)
- Lebedev V.I. (1998) Ore-magmatic systems of the reference arsenide–cobalt deposits. Novosibisk, SO RAN, 136 p. (in Russian)
- Lebedev V.I. (2021) The Khovu-Aksy cobalt-arsenide deposit, Republic of Tuva, Russia: new perspectives on the problems of production and renewal of processing. Geology of Ore Deposits, 63, 212–238. https://doi.org/10.1134/ S1075701521030053
- Lebedev V.I., Borisenko A.S. (1984) Stages of the formation and mineral zoning of arsenide veins of the Khovu-Aksy deposit. In: Geneticheskaya mineralogiya i geokhimiya rudnykh mestorozhdeniy Sibiri (Genetic Mineralogy and Geochemistry of Ore Deposits of Siberia). Novosibirsk, Nauka, 149–164 (in Russian).
- Lebedev V.I., Borovikov A.A., Gushchina L.V., Schabalin S.I. (2019) Physicochemical modeling of hydrothermal mineralization processes at Ni-Co-As (± U-Ag), Co-S-As (± Au-W), and Cu-Co-As (± Sb-Ag) deposits. Geology of Ore Deposits, 61, 225–255. https://doi. org/10.1134/S107570151903005X
- Mandarino J.A. (1981) The Gladstone-Dale relationship. IV. The compatibility concept and its application. Canadian Mineralogist, 41, 989–1002.
- Nefedov E.I. (1953) Report on new minerals discovered by him. Zapiski Vsesoyuznogo Mineralogicheskogo Obshchestva (Proceedings of the All-Union Mineralogical Society), 82, 311–317 (in Russian).
- Rudashevskiy N.S., Mintenkov G.A., Karpenkov A.M., Shishkin N.N. (1977) Ag-bearing pentlandite Ag(Fe,Ni)8S8 – an independent mineral species argentopentlandite. Zapiski Vsesoyuznogo Mineralogicheskogo Obshchestva (Proceedings of the All-Union Mineralogical Society), 106, 688–691 (in Russian)
- Shishkin N.N., Mikhailova V.A. (1969) New data on the mineralization of the Khovu-Aksy nickel-cobalt deposit. Zapiski Vsesoyuznogo Mineralogicheskogo Obshchestva (Proceedings of the All-Union Mineralogical Society), 98, 609–612 (in Russian)
- Yakhontova L.K. (1956) A new mineral – smolyaninovite. Doklady Akademii Nauk SSSR (Doklady Academy of Sciences of the USSR), 109, 849–850 (in Russian)
- Yakhontova L.K., Plusnina I.I. (1981) The new mineral lazarenkoite. Mineralogicheskiy Zhurnal (Mineralogical Journal), 3, 92–96, (in Russian with English abstract)
- Yakhontova L.K., Stolyarova T.I. (1970) New information on vladimirite. Zapiski Vsesoyuznogo Mineralogicheskogo Obshchestva (Proceedings of the All-Union Mineralogical Society), 99, 362–364, (in Russian)
- Zhitova E.S., Sergeeva A.V., Nuzhdaev A.A., Krzhizhanovskaya M.G., Chubarov V.M. (2019) Tschermigite from thermal felds of Southern Kamchatka: high-temperature transformation and peculiarities of IR-spectrum. Zapiski RMO (Proceedings of the Russian Mineralogical Society), 148(1), 100–116, (in Russian) https://doi.org/10.30695/zrmo/2019.1481.08
МИНЕРАЛОГИЯ № 1 2020