| Reference Type | Journal (article/letter/editorial) |
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| Title | Ryabchikovite, CuMg(Si2O6), a new pyroxene group mineral, and some genetic features of natural anhydrous copper silicates |
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| Journal | American Mineralogist |
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| Authors | Shchipalkina, Nadezhda V. | Author |
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| Vereshchagin, Oleg S. | Author |
| Pekov, Igor V. | Author |
| Belakovskiy, Dmitry I. | Author |
| Koshlyakova, Natalia N. | Author |
| Shilovskikh, Vladimir V. | Author |
| Pankin, Dmitriy V. | Author |
| Britvin, Sergey N. | Author |
| Sandalov, Fedor D. | Author |
| Sidorov, Evgeny G. | Author |
| Year | 2023 (July 3) | Volume | 108 |
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| Issue | 7 |
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| Publisher | Mineralogical Society of America |
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| DOI | doi:10.2138/am-2022-8620Search in ResearchGate |
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| Generate Citation Formats |
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| Classification | Not set | LoC | Not set |
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| Mindat Ref. ID | 16519817 | Long-form Identifier | mindat:1:5:16519817:2 |
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| GUID | 0 |
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| Full Reference | Shchipalkina, Nadezhda V., Vereshchagin, Oleg S., Pekov, Igor V., Belakovskiy, Dmitry I., Koshlyakova, Natalia N., Shilovskikh, Vladimir V., Pankin, Dmitriy V., Britvin, Sergey N., Sandalov, Fedor D., Sidorov, Evgeny G. (2023) Ryabchikovite, CuMg(Si2O6), a new pyroxene group mineral, and some genetic features of natural anhydrous copper silicates. American Mineralogist, 108 (7) 1399-1408 doi:10.2138/am-2022-8620 |
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| Plain Text | Shchipalkina, Nadezhda V., Vereshchagin, Oleg S., Pekov, Igor V., Belakovskiy, Dmitry I., Koshlyakova, Natalia N., Shilovskikh, Vladimir V., Pankin, Dmitriy V., Britvin, Sergey N., Sandalov, Fedor D., Sidorov, Evgeny G. (2023) Ryabchikovite, CuMg(Si2O6), a new pyroxene group mineral, and some genetic features of natural anhydrous copper silicates. American Mineralogist, 108 (7) 1399-1408 doi:10.2138/am-2022-8620 |
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| In | (2023, July) American Mineralogist Vol. 108 (7) Mineralogical Society of America |
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| Abstract/Notes | Ryabchikovite, ideally CuMg(Si2O6), a new pyroxene-group mineral (IMA No. 2021-011) was discovered in exhalations of the active Arsenatnaya fumarole, Tolbachik volcano, Kamchatka, Russia. The associated minerals are diopside, hematite, cuprospinel, fluorophlogopite, anhydrite, johillerite, tilasite, and aphthitalite-group sulfates. Ryabchikovite forms thin (up to 25 μm), light brown to reddish-brown epitactic crusts on short-prismatic brownish-gray crystals of diopside (up to 0.5 mm). The new mineral is optically biaxial (+), α = 1.685(5), β = 1.690(5), γ = 1.703(4), and 2V (meas) = 60(15)°. The average chemical composition (wt%, electron microprobe data) is: MgO 18.05, CaO 0.77, CuO 26.46, ZnO 2.23, Al2O3 0.93, Fe2O3 1.89, SiO2 50.10, total 100.43. The empirical formula calculated based on 6 O atoms per formulas unit is (Mg1.05Cu0.78Zn0.06Fe0.063+Ca0.03)(Si1.96Al0.04O6). Electron backscattered diffraction and powder X-ray diffraction show that ryabchikovite is a Cu,Mg-ordered analog of clinoenstatite. Ryabchikovite adopts the space group P21/с and has the following unit-cell parameters: a = 9.731(9), b = 8.929(8), c = 5.221(4) Å, β = 110.00(6)°, V = 426.3(7) Å3, and Z = 4. Ryabchikovite is named in honor of the outstanding Russian geochemist and petrologist Igor Dmitrievich Ryabchikov (1937–2017). Our studies reveal that copper analogs of rock-forming minerals could be found in fumarolic systems. Their crystallization does not require high temperatures or/and pressures (below 500 °C/Pa). |
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