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Vyalsovite
A valid IMA mineral species
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About Vyalsovite
Formula:
FeCaAlS(OH)5
Colour:
Carmine-red
Lustre:
Metallic
Specific Gravity:
2.0 (Calculated)
Crystal System:
Monoclinic
Name:
Named after Leonid Nikolaevich Vyalsov (Леонид Николаевич Вяльсов) (b. 1939), a specialist in reflected-light optics at IGEM, Moscow. He studied the unusual optical properties of this mineral.
The optic sign of vyalsovite changes four times within the range of reflectivity measurements..
Unique Identifiers
Mindat ID:
4219
Long-form identifier:
mindat:1:1:4219:8
IMA Classification of Vyalsovite
Approved
IMA Formula:
CaFe2+AlS2-(OH)5
Approval year:
1989
First published:
1992
Classification of Vyalsovite
2.FD.45
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
2.14.4.1
2 : SULFIDES
14 : Hydroxysulfides and Hydrated Sulfides
2 : SULFIDES
14 : Hydroxysulfides and Hydrated Sulfides
4.6
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 for Standard |
|---|---|---|
| Vyl | 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 Vyalsovite
Optical Data of Vyalsovite
Reflectivity:
| Wavelength | R1 (%) | R2 (%) |
|---|---|---|
| 250nm | 10.1% | 7.7% |
| 260nm | 10.1% | 6.8% |
| 270nm | 9.9% | 6.0% |
| 280nm | 9.8% | 5.8% |
| 290nm | 9.7% | 5.9% |
| 300nm | 9.6% | 6.5% |
| 310nm | 9.5% | 7.4% |
| 320nm | 9.4% | 8.0% |
| 330nm | 9.2% | 8.0% |
| 340nm | 9.0% | 7.6% |
| 350nm | 9.0% | 7.2% |
| 360nm | 9.0% | 6.8% |
| 370nm | 8.8% | 6.5% |
| 380nm | 8.8% | 6.5% |
| 390nm | 8.6% | 6.9% |
| 400nm | 8.5% | 8.0% |
| 410nm | 8.4% | 9.8% |
| 420nm | 8.2% | 11.5% |
| 430nm | 8.2% | 12.0% |
| 440nm | 8.1% | 11.6% |
| 450nm | 8.1% | 10.2% |
| 460nm | 8.1% | 8.9% |
| 470nm | 8.1% | 7.7% |
| 480nm | 8.2% | 6.8% |
| 490nm | 8.3% | 6.9% |
| 500nm | 8.3% | 7.8% |
| 510nm | 8.3% | 9.3% |
| 520nm | 8.2% | 10.8% |
| 530nm | 8.2% | 11.6% |
| 540nm | 8.2% | 11.4% |
| 550nm | 8.1% | 10.5% |
| 560nm | 8.0% | 9.2% |
| 570nm | 8.0% | 8.3% |
| 580nm | 8.0% | 8.2% |
| 590nm | 8.0% | 9.1% |
| 600nm | 7.9% | 11.2% |
| 610nm | 7.9% | 15.1% |
| 620nm | 7.9% | 20.0% |
| 630nm | 7.9% | 25.0% |
| 640nm | 7.9% | 29.0% |
| 650nm | 7.9% | 29.1% |
| 660nm | 7.8% | 27.9% |
| 670nm | 7.8% | 26.6% |
| 680nm | 7.8% | 25.8% |
| 690nm | 7.8% | 25.3% |
| 700nm | 7.8% | 24.7% |
| 710nm | 7.8% | 23.7% |
| 720nm | 7.8% | 22.7% |
| 730nm | 7.8% | 21.7% |
| 740nm | 7.8% | 20.7% |
| 750nm | 7.8% | 19.9% |
| 760nm | 7.8% | 19.2% |
| 770nm | 7.8% | 18.7% |
| 780nm | 7.8% | 18.2% |
| 790nm | 7.8% | 17.9% |
| 800nm | 7.8% | 17.5% |
Graph shows reflectance levels at different wavelengths (in nm). Peak reflectance is 29.1%.
R1 shown in black, R2 shown in red
Comments:
In isotropic (Ro) and nearly isotropic sections, vyalsovite is dark gray; Ro corresponds to the minimum reflectance. In sections parallel to the optic axis, and thus showing Ro and Re, the mineral has extreme bireflectance and reflection pleochroism (dark
Chemistry of Vyalsovite
Mindat Formula:
FeCaAlS(OH)5
Element Weights:
Crystallography of Vyalsovite
Crystal System:
Monoclinic
Class (H-M):
m - Domatic
Space Group:
Bm
Setting:
C1m1
Cell Parameters:
a = 5.205 Å, b = 21.402 Å, c = 14.400 Å
β = 95°
β = 95°
Ratio:
a:b:c = 0.243 : 1 : 0.673
Unit Cell V:
1,598.02 ų (Calculated from Unit Cell)
Z:
8
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 5.40 Å | (100) |
| 4.76 Å | (40) |
| 2.88 Å | (20) |
| 2.58 Å | (20) |
| 2.48 Å | (20) |
| 2.29 Å | (20) |
| 2.24 Å | (20) |
| 2.16 Å | (50) |
| 1.973 Å | (30) |
| 1.894 Å | (30) |
| 1.846 Å | (30) |
| 1.676 Å | (40) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| High-? alteration and/or metamorphism | |
| 31 : Thermally altered carbonate, phosphate, and iron formations | |
| 33 : Minerals deposited by hydrothermal metal-rich fluids (see also [#12]) |
Type Occurrence of Vyalsovite
General Appearance of Type Material:
5- to 150-µm grains and veinlets.
Place of Conservation of Type Material:
A.E. Fersman Mineralogical Museum, Academy of Sciences, Moscow, Russia.
Mineragraphy Laboratory of IGEM, Academy of Sciences, Moscow, Russia.
Mineragraphy Laboratory of IGEM, Academy of Sciences, Moscow, Russia.
Geological Setting of Type Material:
In forsterite skarn at the contact of a gabbro-dolerite intrusion in dolomite.
Associated Minerals at Type Locality:
Synonyms of Vyalsovite
Other Language Names for Vyalsovite
Common Associates
Associations Based on Photo Data:
| 6 photos of Vyalsovite associated with Valleriite | (Fe2+,Cu)4(Mg,Al)3S4(OH,O)6 |
| 6 photos of Vyalsovite associated with Chalcopyrite | CuFeS2 |
| 5 photos of Vyalsovite associated with Magnetite | Fe2+Fe3+2O4 |
| 2 photos of Vyalsovite associated with Forsterite | Mg2(SiO4) |
| 2 photos of Vyalsovite associated with Pentlandite | (NixFey)Σ9S8 |
| 2 photos of Vyalsovite associated with Spinel | MgAl2O4 |
| 1 photo of Vyalsovite associated with Djerfisherite | K6(Fe,Cu,Ni)25S26Cl |
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 | Yushkinite | (Mg,Al)V4+S2(OH)2 |
| 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.30 | Haapalaite | (Fe2+,Ni)2(Mg,Fe2+)1.61S2(OH)3.22 |
| 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.35 | Tochilinite | Fe2+5-6(Mg,Fe2+)5S6(OH)10 |
| 2.FD.35 | Ferrotochilinite | Fe2+6(Fe2+,Mg)5S6(OH)10 |
| 2.FD.40 | Wilhelmramsayite | Cu3FeS3 · 2H2O |
| 2.FD.50 | Bazhenovite | Ca8S2(S3)(S2O3)(OH)12 · 20H2O |
| 2.FD.55 | 'UM2004-56-OS:BiCuPb' | PbCu4Bi4S2(O,OH,H2O)16 (?) |
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 Vyalsovite
mindat.org URL:
https://www.mindat.org/min-4219.html
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References for Vyalsovite
Localities for Vyalsovite
Showing 2 localities.
symbol to view information about a locality.
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 | |
| |
| Evstigneeva et al. (1992) +1 other reference |
Quick NavTopAbout VyalsoviteUnique IdentifiersIMA Classification Classification Mineral SymbolsPhysical Properties Optical Data Chemistry Crystallography X-Ray Powder DiffractionGeological EnvironmentType Occurrence SynonymsOther LanguagesCommon AssociatesStrunz-MindatOther InformationInternet Links References Localities Locality List
Komsomol'skii Mine, Talnakh Cu-Ni Deposit, Norilsk-Talnakh Mining Region, Taimyr Peninsula, Taymyrskiy Autonomous Okrug, Krasnoyarsk Krai, Russia