Lednevite, Cu[PO3 (OH)]·H2O, a new mineral from Murzinskoe Au deposit, Altai Krai, Russia

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Дәйексөз келтіру

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Аннотация

Lednevite, ideally Cu[PO3(OH)]·H2O, is a new mineral discovered at the 255 m level of the Murzinskoe Au deposit, Krasnoshchyokovskiy District, Altai Krai, Western Siberia, Russia. It forms spherulites up to 0.1 mm in diameter, composed of very thin fibers and grouped in aggregates up to 1.5 mm across. Lednevite overgrows philipsburgite crystals on a matrix of epidote-andradite skarn and quartz and associates with malachite, chrysocolla, kaolinite, goethite and P-bearing cornubite. The new mineral is transparent, has sky blue color, very pale blue streak and vitreous lustre. Cleavage is not observed. The Mohs’ hardness is ~3. Dmeas = 3.18(2) g cm–3, Dcalc = 3.196 g cm–3. The chemical composition of lednevite is (electron microprobe, wt.%; H2O by stoichiometry): CuO 40.20, ZnO 3.92, P2O5 36.29, As2O5 4.80, H2O 14.98, total 100.15. The empirical formula calculated on the basis of 3 H and 5 O apfu is (Cu0.91Zn0.09)Σ1.00[(P0.92As0.08)Σ1.00O3(OH)]·H2O. The crystal structure was refined by the Rietveld method to Rp = 0.0042, Rwp = 0.0061, Robs = 0.0354. Lednevite is monoclinic, space group P21/a, with a = 8.6459(6), b = 6.3951(4), c = 6.8210(5) A, β = 93.866(2)°, V = 376.28(4) A3 and Z = 4. The strongest lines of the powder X-ray diffraction pattern [d, A (I, %) (hkl)] are: 5.135 (100) (110), 4.648 (33) (011), 3.241 (28) (21-1), 3.095 (49) (211), 2.891 (27) (11-2), 2.775 (53) (112), 2.568 (29) (220). The new mineral is isotypic to the synthetic CuHPO4·H2O. Some optical and spectroscopic data, which could not be obtained on natural sample, were obtained from the synthesized material. The crystal structure of the synthetic analogue of lednevite was solved from single-crystal X-ray diffraction data and refined to R1 = 0.0173 for 1159 independent reflections with I > 2σ(I). All positions of H atoms were determined. Lednevite is named for Vladimir Sergeevich Lednev, amateur mineralogist from Barnaul (Altai Krai) who collected the sample with the new mineral.

Толық мәтін

Рұқсат жабық

Авторлар туралы

A. Kasatkin

Fersman Mineralogical Museum RAS

Хат алмасуға жауапты Автор.
Email: anatoly.kasatkin@gmail.com
Ресей, Moscow

N. Zubkova

Moscow State University

Email: anatoly.kasatkin@gmail.com

Faculty of Geology

Ресей, Moscow

V. Gurzhiy

Saint Petersburg State University

Email: anatoly.kasatkin@gmail.com

Department of Crystallography, Institute of Earth Sciences

Ресей, Saint-Petersburg

R. Škoda

Masaryk University

Email: anatoly.kasatkin@gmail.com

Department of Geological Sciences, Faculty of Science

Чехия, Brno

F. Nestola

University of Padova

Email: anatoly.kasatkin@gmail.com

Department of Geosciences

Италия, Padova

A. Agakhanov

Fersman Mineralogical Museum RAS

Email: anatoly.kasatkin@gmail.com
Ресей, Moscow

N. Chukanov

Federal Research Center of Problems of Chemical Physics and Medicinal Chemistry RAS

Email: anatoly.kasatkin@gmail.com
Ресей, Chernogolovka

D. Belakovskiy

Fersman Mineralogical Museum RAS

Email: anatoly.kasatkin@gmail.com
Ресей, Moscow

D. Všianský

Masaryk University

Email: anatoly.kasatkin@gmail.com

Department of Geological Sciences, Faculty of Science

Чехия, Brno

Әдебиет тізімі

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2. Fig. 1. Geological map of the Murzinskoe deposit (after Murzin et al. (2015) with changes). FOV: 1.4 × 1.7 km.

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3. Fig. 2. Open pit of the Murzinskoe Au deposit, 255 m level. May 2023. Photo by Vladimir S. Lednev.

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4. Fig. 3. Lednevite (sky-blue) on philipsburgite (green) with quartz. FOV: 3.3 × 3.7 mm. Photo by Maria D. Milshina.

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5. Fig. 4. Lednevite spherical aggregates (grey) on philipsburgite (light grey). Polished section. SEM (BSE) image.

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6. Fig. 5. The infrared spectrum of the synthetic analogue of lednevite.

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7. Fig. 6. The Raman spectra of a) lednevite, and b), c) its synthetic analogue excited by 532 nm laser in the 50–4000 cm–1 region. The measured spectrum is shown by dots. The curve matching to dots is a result of spectral fit as a sum of individual Voigt peaks shown below the curve. Spectra b) and c) were collected with the laser polarization perpendicular and parallel to the crystal elongation, respectively.

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8. Fig. 7. Observed and calculated PXRD patterns of the sample containing lednevite (L) and spertiniite (S). The solid line corresponds to calculated data, the crosses correspond to the observed pattern, vertical bars mark all possible Bragg reflections. The upper row refers to spertiniite and the lower one to lednevite. The difference between the observed and calculated patterns is shown at the bottom.

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9. Fig. 8. The crystal structure of lednevite projected along b axis (a) and c axis (b). The unit cell is outlined.

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10. Fig. 9. H-bonding system in the crystal structure of the synthetic analogue of lednevite.

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