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Ryabchikovite, CuMg(Si2O6), a new pyroxene group mineral, and some genetic features of natural anhydrous copper silicates

  • Nadezhda V. Shchipalkina , Oleg S. Vereshchagin ORCID logo , Igor V. Pekov , Dmitry I. Belakovskiy , Natalia N. Koshlyakova , Vladimir V. Shilovskikh , Dmitriy V. Pankin , Sergey N. Britvin , Fedor D. Sandalov and Evgeny G. Sidorov
Published/Copyright: July 10, 2023
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American Mineralogist
From the journal American Mineralogist Volume 108 Issue 7

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 M g 1.05 C u 0.78 Z n 0.06 F e 0.06 3 + C a 0.03 S i 1.96 A l 0.04 O 6 Electron backscattered diffraction and powder X-ray difraction 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).

Keywords: Ryabchikovite; new mineral; pyroxene; fumarole sublimate; copper silicate; gas transport reaction; Tolbachik volcano

† Deceased 20 March 2021

Funding statement: This work was supported by the Russian Science Foundation, grant no. 1917-00050. The authors thank the Resource Center of X-ray diffraction studies and Geomodel Resource Centre of Saint-Petersburg State University for providing instrumental and computational resources. Raman measurements were partly performed at SPbSU Research park Center for optical and laser materials research with financial support from St. Petersburg State University (project no. 93021679).

Acknowledgments

We are grateful to Mario Tribaudino, Frank C. Hawthorne, and an anonymous reviewer for valuable comments and suggestions for improving the paper, and Fabrizio Nestola for his editorial work.

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Received: 2022-06-01
Accepted: 2022-08-18
Published Online: 2023-07-10
Published in Print: 2023-07-26

© 2023 by Mineralogical Society of America

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https://doi.org/10.2138/am-2022-8620
Keywords for this article
Ryabchikovite; new mineral; pyroxene; fumarole sublimate; copper silicate; gas transport reaction; Tolbachik volcano

Articles in the same Issue

  1. On the origin of fluorine-poor apatite in chondrite parent bodies
  2. Fluorine behavior during experimental muscovite dehydration melting and natural partitioning between micas: Implications for the petrogenesis of peraluminous leucogranites and pegmatites
  3. Telescoped boiling and cooling mechanisms triggered hydrothermal stibnite precipitation: Insights from the world’s largest antimony deposit in Xikuangshan China
  4. MSA Distinguished Lecturer Series Correlations between cathodoluminescence intensity and aluminum concentration in low-temperature hydrothermal quartz
  5. Behavior of hydrogen defect and framework of Fe-bearing wadsleyite and ringwoodite at high temperature and high pressure
  6. What is mineral informatics?
  7. Metal source and hydrothermal evolution of the Jiaoxi quartz vein-type tungsten deposit (Tibet): Insights from textural and compositional variations of wolframite and scheelite
  8. Geochemical processes and mechanisms for cesium enrichment in a hot-spring system
  9. Identifying xenocrystic tourmaline in Himalayan leucogranites
  10. Contrasting alteration textures and geochemistry of allanite from uranium-fertile and barren granites: Insights into granite-related U and ion-adsorption REE mineralization
  11. Feiite: Synthesis, stability, and implications for its formation conditions in nature
  12. Thermal equation of state of Fe3O4 magnetite up to 16 GPa and 1100 K
  13. UHP eclogite from western Dabie records evidence of polycyclic burial during continental subduction
  14. CO2 quantification in silicate glasses using μ-ATR FTIR spectroscopy
  15. Local structure determination of Zn-smectite
  16. A new UHP unit in the Western Alps: First occurrence of coesite from the Monviso Massif (Italy)
  17. Mineral evolution and mineral niches of ammonium sulfates: The case of Pastora mine, Aliseda, Spain
  18. Discrete late Jurassic Sn mineralizing events in the Xianghualing Ore District, South China: Constraints from cassiterite and garnet U-Pb geochronology
  19. Ryabchikovite, CuMg(Si2O6), a new pyroxene group mineral, and some genetic features of natural anhydrous copper silicates
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