IMA 2021-011 = ryabchikovite

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Marco E. Ciriotti
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IMA 2021-011 = ryabchikovite

Messaggio da Marco E. Ciriotti » ven 09 set, 2022 9:24

Prossima pubblicazione.

Referenza:
▪ Shchipalkina, N.V., Vereshchagin, O.S., Pekov, I.V., Belakovskiy, D.I., Koshlyakova, N.N., Shilovskikh, V.V., Pankin, D.V., Britvin, S.N., Sandalov, F.D., Sidorov, E.G. (2023): Ryabchikovite, CuMg(Si2O6), a new pyroxene group mineral, and some genetic features of natural anhydrous copper silicates. American Mineralogist, 108, (in press).
Marco E. Ciriotti

«Things are interesting only in so far as they relate themselves to other things»

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Marco E. Ciriotti
Messaggi: 31675
Iscritto il: ven 25 giu, 2004 11:31
Località: via San Pietro, 55 I-10073 Devesi/Cirié TO - Italy
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Re: IMA 2021-011 = ryabchikovite

Messaggio da Marco E. Ciriotti » sab 08 lug, 2023 10:00

Pubblicazione effettuata.

Referenza:
▪ Shchipalkina, N.V., Vereshchagin, O.S., Pekov, I.V., Belakovskiy, D.I., Koshlyakova, N.N., Shilovskikh, V.V., Pankin, D.V., Britvin, S.N., Sandalov, F.D., Sidorov, E.G. (2023): Ryabchikovite, CuMg(Si2O6), a new pyroxene group mineral, and some genetic features of natural anhydrous copper silicates. American Mineralogist, 108, 1399-1408.

Abstract:
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 (Mg1.05Cu0.78Zn0.06Fe3+0.06Ca0.03)(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).
Marco E. Ciriotti

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