Yushkinite
A valid IMA mineral species
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About Yushkinite
Nikolai P. Yushkin
Formula:
(Mg,Al)V4+S2(OH)2
Colour:
Pinkish purple
Lustre:
Metallic
Hardness:
1
Specific Gravity:
2.94
Crystal System:
Trigonal
Member of:
Name:
Named in honor of Nikolai Pavlovich Yushkin (Николай Павлович Юшкин) (20 May 1936, Kalinin region, USSR - 17 September 2012, Syktyvkar, Russia), mineralogist at the Institute of Geology of the Komi Scientific Center of the Ural Institute of Economics, head of the Department of Geology of Syktyvkar State University. He was interested in the mineral resources of the northern European part of Russia and the Urals. He served as vice-president of both the International Mineralogical Association and the Russian Mineralogical Society.
Unique Identifiers
Mindat ID:
4379
Long-form identifier:
mindat:1:1:4379:9
GUID
(UUID V4):
(UUID V4):
c67c01d5-549f-4814-a791-a53a7057ddc3
IMA Classification of Yushkinite
Approved
IMA Formula:
(Mg,Al)(OH)2VS2
Approval year:
1983
First published:
1984
Classification of Yushkinite
2.FD.30
2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
F : Sulfides of arsenic, alkalies; sulfides with halide, oxide, hydroxide, H2O
D : With O, OH, H2O
2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
F : Sulfides of arsenic, alkalies; sulfides with halide, oxide, hydroxide, H2O
D : With O, OH, H2O
2.14.3.2
2 : SULFIDES
14 : Hydroxysulfides and Hydrated Sulfides
2 : SULFIDES
14 : Hydroxysulfides and Hydrated Sulfides
4.5
4 : Oxysulphides
4 : Oxysulphides
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 |
|---|---|---|
| Yus | 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 Yushkinite
Metallic
Transparency:
Opaque
Colour:
Pinkish purple
Comment:
Strong copper magenta and orange red tarnish
Hardness:
1 on Mohs scale
Cleavage:
Perfect
on {001}
on {001}
Density:
2.94(2) g/cm3 (Measured) 3.00 g/cm3 (Calculated)
Optical Data of Yushkinite
Anisotropism:
Strong, orange-red with weak lilac tint in isotropic sections, red-lilac to pinkish dark gray in anisotropic sections.
Reflectivity:
| Wavelength | R1 | R2 | imR1 | imR2 |
|---|---|---|---|---|
| 400nm | 21.1% | 10.1% | 7.01% | 1.91% |
| 420nm | 20.8% | 10.5% | 7.30% | 1.94% |
| 440nm | 18.7% | 10.6% | 6.89% | 1.97% |
| 460nm | 17.0% | 10.4% | 6.25% | 1.95% |
| 470nm | 16.4% | 10.5% | 5.95% | 1.93% |
| 480nm | 15.5% | 10.3% | 5.56% | 1.94% |
| 500nm | 14.3% | 10.5% | 5.08% | 1.96% |
| 520nm | 13.8% | 10.3% | 5.24% | 1.95% |
| 540nm | 14.4% | 10.3% | 5.84% | 1.90% |
| 546nm | 14.6% | 10.3% | 6.24% | 1.91% |
| 560nm | 15.4% | 10.4% | 7.07% | 1.88% |
| 580nm | 17.4% | 10.2% | 8.96% | 1.84% |
| 589nm | 18.4% | 10.3% | 9.66% | 1.82% |
| 600nm | 19.8% | 10.4% | 10.8% | 1.88% |
| 620nm | 22.3% | 10.4% | 12.6% | 1.94% |
| 640nm | 24.8% | 10.1% | 15.0% | 1.93% |
| 650nm | 26.7% | 10.4% | 15.3% | 1.91% |
| 660nm | 27.7% | 10.0% | 16.1% | 1.85% |
| 680nm | 29.1% | 10.3% | 17.5% | 1.91% |
| 700nm | 30.4% | 10.5% | 18.3% | 1.94% |
| 720nm | 32.3% | 10.9% | 18.7% | 1.90% |
| 740nm | 31.8% | 10.9% | 18.2% | 2.06% |
| 760nm | 31.8% | 10.3% | 18.0% | 2.18% |
| 780nm | 31.6% | 11.2% | 17.5% | 1.90% |
| 800nm | 29.6% | 10.2% | 16.9% | 1.88% |
Graph shows reflectance levels at different wavelengths (in nm). Top of box is 100%. Peak reflectance is 32.3%.
R1 shown in black, R2 shown in red, imR1 shown in green, imR2 shown in blue
Comments:
Reflectance data from Moëlo et al. (1999).
Chemistry of Yushkinite
Mindat Formula:
(Mg,Al)V4+S2(OH)2
Crystallography of Yushkinite
Crystal System:
Trigonal
Class (H-M):
3m (3 2/m) - Hexagonal Scalenohedral
Space Group:
P3m1
Setting:
P3m1
Cell Parameters:
a = 3.25 Å, c = 11.40 Å
Ratio:
a:c = 1 : 3.508
Unit Cell V:
104.28 ų (Calculated from Unit Cell)
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 5.68 Å | (100) |
| 2.76 Å | (60) |
| 1.575 Å | (60) |
| 1.596 Å | (40) |
| 11.4 Å | (30) |
| 1.534 Å | (30) |
| 1.386 Å | (30) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Near-surface Processes | |
| 23 : Subaerial aqueous alteration by non-redox-sensitive fluids (see also #47) | |
| High-𝑇 alteration and/or metamorphism | |
| 33 : Minerals deposited by hydrothermal metal-rich fluids (see also [#12]) |
Type Occurrence of Yushkinite
Place of Conservation of Type Material:
Komi Branch of Academy of Sciences, Syktyvkar, Russia.
Mining Institute, St. Petersburg, Russia, 1501/1.
Institute of Geology of Ore Deposits, Petrography, Mineralogy and Geochemistry, Moscow, Russia.
A.E. Fersman Mineralogical Museum, Academy of Sciences, Moscow, Russia, 84284.
Mining Institute, St. Petersburg, Russia, 1501/1.
Institute of Geology of Ore Deposits, Petrography, Mineralogy and Geochemistry, Moscow, Russia.
A.E. Fersman Mineralogical Museum, Academy of Sciences, Moscow, Russia, 84284.
Reference:
Makeev, A.B., Evstigneeva, T.L., Troneva, N.V., Vyalsov, L.N., Gorshkov, A.I., Trubkin, N.V. (1984) Yushkinite V1-xS·n[(Mg,Al)(OH)2] - a new mineral. Mineralogiceskij Zhurnal: 6: 91-98.
Synonyms of Yushkinite
Other Language Names for Yushkinite
German:Yushkinit
Spanish:Yushkinita
Relationship of Yushkinite to other Species
Member of:
Other Members of this group:
| Ekplexite | (Nb,Mo,W)S2 · (Mg1-xAlx)(OH)2+x | Trig. |
| Ferrotochilinite | Fe2+6(Fe2+,Mg)5S6(OH)10 | Mon. |
| Ferrovalleriite | 2(Fe,Cu)S · 1.5Fe(OH)2 | Trig. |
| Haapalaite | (Fe2+,Ni)2(Mg,Fe2+)1.61S2(OH)3.22 | Hex. |
| Tochilinite | Fe2+5-6(Mg,Fe2+)5S6(OH)10 | Mon. |
| Valleriite | (Fe2+,Cu)4(Mg,Al)3S4(OH,O)6 | Trig. |
Related Minerals - Strunz-mindat Grouping
| 2.FD. | Ferrovalleriite | 2(Fe,Cu)S · 1.5Fe(OH)2 |
| 2.FD.05 | Kermesite | Sb2S2O |
| 2.FD.10 | Viaeneite | (Fe,Pb)4S8O |
| 2.FD.20 | Erdite | NaFeS2 · 2H2O |
| 2.FD.25 | Coyoteite | NaFe3S5 · 2H2O |
| 2.FD.30 | Haapalaite | (Fe2+,Ni)2(Mg,Fe2+)1.61S2(OH)3.22 |
| 2.FD.30 | Valleriite | (Fe2+,Cu)4(Mg,Al)3S4(OH,O)6 |
| 2.FD.30 | Ekplexite | (Nb,Mo,W)S2 · (Mg1-xAlx)(OH)2+x |
| 2.FD.35 | Tochilinite | Fe2+5-6(Mg,Fe2+)5S6(OH)10 |
| 2.FD.35 | Ferrotochilinite | Fe2+6(Fe2+,Mg)5S6(OH)10 |
| 2.FD.35 | Kaskasite | (Mo,Nb)S2 · (Mg1-xAlx)(OH)2+x |
| 2.FD.35 | Manganokaskasite | (Mo,Nb)S2 · (Mn1-xAlx)(OH)2+x |
| 2.FD.40 | Wilhelmramsayite | Cu3FeS3 · 2H2O |
| 2.FD.45 | Vyalsovite | FeCaAlS(OH)5 |
| 2.FD.50 | Bazhenovite | Ca8S2(S3)(S2O3)(OH)12 · 20H2O |
| 2.FD.55 | UM2004-56-OS:BiCuPb | PbCu4Bi4S2(O,OH,H2O)16 (?) |
Other Information
Notes:
Becomes dark and decomposes in concentrated HCl and HNO3; quickly becomes brown in 10% FeCl2.
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 Yushkinite
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https://www.mindat.org/min-4379.html
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References for Yushkinite
Localities for Yushkinite
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The Locality List
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- 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) | |
| Geology of Ore Deposits Volume 50 +2 other references |
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Yushkinite gorge, Middle Silova-Yakha River, Pai-Khoi Range, Yugorskii Peninsula, Nenets Autonomous Okrug, Russia