Belogubite, a new mineral of the chalcanthite group from the Gayskoe deposit, South Urals, Russia

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Belogubite, ideally CuZn(SO4)2·10H2O, has been found in the supergene zone uncovered by the open pit at the Gayskoe massive sulfide Zn-Cu deposit (Orenburgskaya region, the South Urals, Russia). It is associated with dietrichite and may contain relics of quartz. Belogubite forms aggregates of blue grains up to 1 mm in size. The mineral is transparent with vitreous luster and white streak. Its color varies from pale equant to light blue. Cleavage and parting were not observed. The new mineral is brittle and has Mohsʼ hardness ca. 2½. Its density measured by floatation in bromoform+ethanol is 2.27(2) g/cm–3, its calculated density is 2.249 g/cm–3. Belogubite is biaxial (–), α = 1.512(2), β = 1.525(2), γ = 1.531(2); 2V (meas.) = 70(10)°, 2V (calc.) = 67.9°. Dispersion is noticeable, r < v. The mineral is nonpleochroic. Chemical composition of the holotype sample is (wt %, electron microprobe data, H2O determined by thermogravimetry): MgO 1.12, MnO 0.10, FeO 3.15, CuO 8.98, ZnO 18.02, SO3 32.49, H2O 36.75, total 100.61. Its empirical formula calculated on the basis of 18 O apfu is: (Cu0.55Zn0.45)Σ1.00(Zn0.64Fe0.22Mg0.14Mn0.01)Σ1.01S1.99O7.98·10.02H2O. The structure was solved by direct methods and refined on the basis of 1797 independent reflections to R = 0.016. Belogubite is triclinic, P1̅ . Unit cell parameters are: a = 6.2548(1), b = 10.6112(2), c = 6.0439(1) Å, α = 82.587(1), β = 109.625(1), γ = 104.848(1)°, V = 364.81(1) Å3, Z = 1. The strongest reflections of the powder XRD pattern are [dobs, Å (I) (hkl)]: 5.73 (35) (100), 5.576 (47) (–110), 4.873 (100) (–111), 3.907 (31) (021), 3.719 (45) (0 –21), 3.229 (27) (111), 2.915 (25) (–221), 2.684 (26) (130). Belogubite is a new, CuZn-ordered member of the chalcanthite group having M1 cationic site preferentially occupied by Cu whereas M2 site is dominated by Zn with subordinate substitution of Fe2+ and Mg. The mineral is named in honor of Elena Vitalievna Belogub (born 1963), major researcher of the Institute of Mineralogy of the Urals Branch of Russian Academy of Sciences, Miass, Chelyabinsk Oblast, Russia, a well-known expert in the mineralogy of volcanic-hosted massive sulfide copper deposits of South Urals.

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Anatoly Kasatkin

Fersman Mineralogical Museum of the Russian Academy of Sciences

编辑信件的主要联系方式.
Email: kasatkin@inbox.ru
ORCID iD: 0000-0002-9016-9947
SPIN 代码: 3798-4136
Scopus 作者 ID: 55438217300
Researcher ID: C-3057-2019
俄罗斯联邦, Leninsky Prospekt 18-2, Moscow, Russia, 119071

Sergey Britvin

Saint Petersburg State University

Email: sbritvin@gmail.com

Department of Crystallography

俄罗斯联邦, University Embankment 7/9, St Petersburg, Russia, 199034 

Nikita Chukanov

Institute of Problems of Chemical Physics RAS

Email: nikchukanov@yandex.ru
俄罗斯联邦, Chernogolovka, Moscow Oblast, 142432

Radek Škoda

Masaryk University

Email: rskoda@sci.muni.cz

Department of Geological Sciences, Faculty of Science

捷克共和国, Kotlářská 2,  Brno, Czech Republic, 611 37

Atali Agakhanov

Fersman Mineralogical Museum of the Russian Academy of Sciences

Email: atali99@mail.ru
俄罗斯联邦, Leninsky Prospekt 18-2, Moscow, Russia, 119071

Dmitriy Belakovskiy

Fersman Mineralogical Museum of the Russian Academy of Sciences

Email: dmz@fmm.ru
俄罗斯联邦, Leninsky Prospekt 18-2, Moscow, Russia, 119071

参考

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