Ryabchikovite
A valid IMA mineral species
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Igor D. Ryabchikov
Formula:
CuMgSi2O6
Colour:
Light brown to reddish-brown
Crystal System:
Monoclinic
Member of:
Name:
Named in honor of Igor Dmitrievich Ryabchikov (Игорь Дмитриевич Рябчиков) (5 September 1937, Moscow , USSR – 27 November 2017), Russian geochemist, petrologist, and professor at the Institute of Geology of Ore Deposits, Petrography, Mineralogy and Geochemistry of the Russian Academy of Sciences (IGEM RAS), Moscow. He made significant contributions in areas related to magmatic rocks and systems.
The first pyroxene with Cu as an essential component. The Cu analogue of diopside. Second silicate mineral with Cu and Mg as essential cations after cyprine.
Unique Identifiers
Mindat ID:
55453
Long-form identifier:
mindat:1:1:55453:4
IMA Classification of Ryabchikovite
Approved
IMA Formula:
Cu2+MgSi2O6
Approval year:
2021
First published:
2023
Type description 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
Classification of Ryabchikovite
9.DA.
9 : SILICATES (Germanates)
D : Inosilicates
A : Inosilicates with 2-periodic single chains, Si2O6; pyroxene family
9 : SILICATES (Germanates)
D : Inosilicates
A : Inosilicates with 2-periodic single chains, Si2O6; pyroxene family
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference for Standard |
|---|---|---|
| Ryb | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Ryabchikovite
Colour:
Light brown to reddish-brown
Optical Data of Ryabchikovite
Type:
Biaxial (+)
RI values:
nα = 1.685(5) nβ = 1.690(5) nγ = 1.703(4)
2V:
Measured: 60° (15), Calculated: 64°
Max. Birefringence:
δ = 0.018
Based on recorded range of RI values above.
Based on recorded range of RI values above.
Interference Colours:
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
Surface Relief:
Very High (positive)
Relative to Canada balsam mounting medium (n ≈ 1.537).
Relative to Canada balsam mounting medium (n ≈ 1.537).
This shows the grain boundary and Becke line effect under plane-polarised
light, based on the contrast between this mineral's average refractive
index and the mounting medium. It does not take into account mineral
colouration.
In focus
Interference Figure:
This shows the idealized biaxial acute bisectrix (Bxa) interference figure
- the conoscopic view for a grain cut perpendicular to the acute bisectrix, using
this mineral's 2V. The two small white dots mark the melatopes - the points
where the two optic axes emerge - and are shown only when they fall within the
field of view. The coloured bands are isochromatics, and the dark bands are
isogyres.
Rotate the stage: at 0°/90° the isogyres form a cross through the melatopes; at 45° they pull apart into curved hyperbolas. That splitting on rotation - absent in a uniaxial figure - is the standard diagnostic test for telling biaxial minerals from uniaxial ones. If 2V is large, the melatopes may fall outside the field of view, as they often do at the microscope too.
Rotate the stage: at 0°/90° the isogyres form a cross through the melatopes; at 45° they pull apart into curved hyperbolas. That splitting on rotation - absent in a uniaxial figure - is the standard diagnostic test for telling biaxial minerals from uniaxial ones. If 2V is large, the melatopes may fall outside the field of view, as they often do at the microscope too.
Dispersion:
None observed.
Optical Extinction:
Z ∧ c = 47° (where [001] is considered to be parallel to [001] of the underlying diopside crystal of the type material).
Pleochroism:
Non-pleochroic
Chemistry of Ryabchikovite
Mindat Formula:
CuMgSi2O6
Element Weights:
Elements listed:
Chemical Analysis
Oxide wt%:
| 1 | |
|---|---|
| MgO | 18.05 % |
| CaO | 0.77 % |
| CuO | 26.46 % |
| ZnO | 2.23 % |
| Al2O3 | 0.93 % |
| Fe2O3 | 1.89 % |
| SiO2 | 50.10 % |
| Total | 100.43 % |
| Total: | 200.86 % |
Empirical formulas:
| Sample ID | Empirical Formula |
|---|---|
| 1 | (Mg1.05Cu0.78Zn0.06Fe3+0.06Ca0.03)(Si1.96Al0.04O6) |
Sample references:
| ID | Locality | Reference | Notes |
|---|---|---|---|
| 1 | Arsenatnaya fumarole, Second scoria cone, Northern Breakthrough, Great Fissure eruption, Tolbachik Volcanic field, Milkovsky District, Kamchatka Krai, Russia | by EPMA (WDS); empirical formula basis: 6 O atoms pfu |
Crystallography of Ryabchikovite
Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P21/b
Setting:
P21/c
Cell Parameters:
a = 9.731(9) Å, b = 8.929(8) Å, c = 5.221(4) Å
β = 110.00(6)°
β = 110.00(6)°
Ratio:
a:b:c = 1.09 : 1 : 0.585
Unit Cell V:
426.28 ų (Calculated from Unit Cell)
Z:
4
Epitaxial Relationships of Ryabchikovite
Epitaxial Minerals:
| 'Diopside' | CaMgSi2O6 |
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 4.403 Å | (38) |
| 4.307 Å | (27) |
| 3.746 Å | (32) |
| 3.291 Å | (27) |
| 3.177 Å | (100) |
| 2.876 Å | (75) |
| 2.456 Å | (26) |
| 2.215 Å | (26) |
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
Type Occurrence of Ryabchikovite
General Appearance of Type Material:
Thin (25 μm max, typically < 10 μm) epitactic crusts on well-formed prismatic diopside crystals.
Place of Conservation of Type Material:
Collections of the Fersman Mineralogical Museum, Russian Academy of Sciences, Leninskiy Prospekt 18-2, Moscow 119071, Russia, registration number 5642/1.
Geological Setting of Type Material:
Fumarole, at temperatures higher than 400–450ºC, likely due to an interaction between Cu-bearing fumarolic gas and earlier formed diopside.
Associated Minerals at Type Locality:
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
Synonyms of Ryabchikovite
Other Language Names for Ryabchikovite
Dutch:Ryabchikoviet
German:Ryabchikovit
Relationship of Ryabchikovite to other Species
Member of:
Other Members of Clinopyroxene Subgroup:
| Aegirine | NaFe3+Si2O6 | Mon. 2/m : B2/b |
| Aegirine-augite | (NaaCabFe2+cMgd)(Fe3+eAlfFe2+gMgh)Si2O6 | Mon. 2/m : B2/b |
| Augite | (CaxMgyFez)(Mgy1Fez1)Si2O6 | Mon. 2/m : B2/b |
| Burnettite | CaVAlSiO6 | Mon. 2/m : B2/b |
| Clinoenstatite | MgSiO3 | Mon. 2/m : P21/b |
| Clinoferrosilite | Fe2+2Si2O6 | Mon. 2/m : P21/b |
| Colomeraite | NaTi3+Si2O6 | Mon. 2/m : B2/b |
| Davisite | CaScAlSiO6 | Mon. 2/m : B2/b |
| Diopside | CaMgSi2O6 | Mon. 2/m : B2/b |
| Esseneite | CaFe3+[AlSiO6] | Mon. 2/m : B2/b |
| Grossmanite | CaTi3+ AlSiO6 | Mon. 2/m : B2/b |
| Hedenbergite | CaFe2+Si2O6 | Mon. 2/m : B2/b |
| Jadeite | Na(Al,Fe3+)Si2O6 | Mon. 2/m : B2/b |
| Jervisite | NaSc3+Si2O6 | Mon. 2/m : B2/b |
| Johannsenite | CaMn2+Si2O6 | Mon. 2/m : B2/b |
| Kanoite | Mn2+MgSi2O6 | Mon. 2/m : P21/b |
| Kosmochlor | NaCrSi2O6 | Mon. 2/m : B2/b |
| Kushiroite | CaAlAlSiO6 | Mon. 2/m : B2/b |
| Namansilite | NaMn3+Si2O6 | Mon. 2/m : B2/b |
| Natalyite | NaV3+Si2O6 | Mon. 2/m : B2/b |
| Omphacite | (NaaCabFe2+cMgd)(AleFe3+fFe2+gMgh)Si2O6 | Mon. 2/m |
| Petedunnite | CaZnSi2O6 | Mon. 2/m : B2/b |
| Pigeonite | (CaxMgyFez)(Mgy1Fez1)Si2O6 | Mon. 2/m : P21/b |
| Spodumene | LiAlSi2O6 | Mon. 2/m : B2/b |
| Tissintite | (Ca,◻)AlSi2O6 | Mon. 2/m : B2/b |
| 'UM2003-36-SiO:CaNa' | NaCrSi2O6 - CaMgSi2O6 | Mon. 2/m : B2/b |
Related Minerals - Strunz-mindat Grouping
| 9.DA. | Colomeraite | NaTi3+Si2O6 |
| 9.DA. | Protoenstatite | Mg2Si2O6 |
| 9.DA.05 | Donpeacorite | Mn2+MgSi2O6 |
| 9.DA.05 | Enstatite | Mg2Si2O6 |
| 9.DA.05 | Ferrosilite | Fe2+2Si2O6 |
| 9.DA.10 | Clinoenstatite | MgSiO3 |
| 9.DA.10 | Clinoferrosilite | Fe2+2Si2O6 |
| 9.DA.10 | Kanoite | Mn2+MgSi2O6 |
| 9.DA.10 | Pigeonite | (CaxMgyFez)(Mgy1Fez1)Si2O6 |
| 9.DA.15 | Grossmanite | CaTi3+ AlSiO6 |
| 9.DA.15 | Diopside | CaMgSi2O6 |
| 9.DA.15 va | 'Jeffersonite' | Ca(Mn,Zn,Fe)Si2O6 |
| 9.DA.15 | Hedenbergite | CaFe2+Si2O6 |
| 9.DA.15 | Johannsenite | CaMn2+Si2O6 |
| 9.DA.15 | Petedunnite | CaZnSi2O6 |
| 9.DA.15 | Esseneite | CaFe3+[AlSiO6] |
| 9.DA.15 | Kushiroite | CaAlAlSiO6 |
| 9.DA.15 | Augite | (CaxMgyFez)(Mgy1Fez1)Si2O6 |
| 9.DA.15 | Davisite | CaScAlSiO6 |
| 9.DA.20 | Aegirine-augite | (NaaCabFe2+cMgd)(Fe3+eAlfFe2+gMgh)Si2O6 |
| 9.DA.20 | Omphacite | (NaaCabFe2+cMgd)(AleFe3+fFe2+gMgh)Si2O6 |
| 9.DA.25 | Jadeite | Na(Al,Fe3+)Si2O6 |
| 9.DA.25 | Namansilite | NaMn3+Si2O6 |
| 9.DA.25 | Natalyite | NaV3+Si2O6 |
| 9.DA.25 | Aegirine | NaFe3+Si2O6 |
| 9.DA.25 | Jervisite | NaSc3+Si2O6 |
| 9.DA.25 | Tissintite | (Ca,◻)AlSi2O6 |
| 9.DA.25 | Kosmochlor | NaCrSi2O6 |
| 9.DA.30 | Spodumene | LiAlSi2O6 |
| 9.DA.35 | Hiroseite | FeSiO3 |
Other Information
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for Ryabchikovite
mindat.org URL:
https://www.mindat.org/min-55453.html
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References for Ryabchikovite
Reference List:
Miyawaki, Ritsuro, Hatert, Frédéric, Pasero, Marco, Mills, Stuart J. (2021) IMA Commission on New Minerals, Nomenclature and Classification (CNMNC) – Newsletter 61. European Journal of Mineralogy, 33 (3) 299-304 doi:10.5194/ejm-33-299-2021
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
Localities for Ryabchikovite
Showing 1 localities.
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The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and further information on this occurrence.
? - Indicates mineral may be doubtful at this locality.
- Good crystals or important locality for species.
- World class for species or very significant.
(TL) - Type Locality for a valid mineral species.
(FRL) - First Recorded Locality for everything else (eg varieties).
All localities listed without proper references should be considered as questionable.
Russia (TL) | |
| Miyawaki et al. (2021) +1 other reference |
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