Yegorovite
A valid IMA mineral species
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About Yegorovite
Formula:
Na4[Si4O8(OH)4] · 7H2O
Colour:
Colorless
Lustre:
Vitreous
Hardness:
2
Specific Gravity:
1.90
Crystal System:
Monoclinic
Name:
Named in honor of Yuriy Klavdievich Yegorov-Tismenko (Юрий Клавдиевич Егоров-Тисменко) (26 May 1938 - 16 July 2007) crystal chemist, crystallographer, at the Moscow State University. He won the 2003 Lomonosov Prize for teaching.
The first natural sodium silicate with single zig-zag chains of Si tetrahedra.
Unique Identifiers
Mindat ID:
38851
Long-form identifier:
mindat:1:1:38851:5
GUID
(UUID V4):
(UUID V4):
b8d5ced1-2ca7-409f-9ede-992e03be0a81
Classification of Yegorovite
Approved
Approval year:
2008
First published:
2010
Type description reference:
9.00.
9 : SILICATES (Germanates)
0 :
0 :
9 : SILICATES (Germanates)
0 :
0 :
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 |
---|---|---|
Yeg | 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 Yegorovite
Vitreous
Transparency:
Transparent
Colour:
Colorless
Streak:
White
Hardness:
2 on Mohs scale
Cleavage:
Perfect
(010) and (001)
(010) and (001)
Fracture:
Splintery
Density:
1.90(2) g/cm3 (Measured) 1.92 g/cm3 (Calculated)
Optical Data of Yegorovite
Type:
Biaxial (-)
RI values:
nα = 1.474(2) nβ = 1.479(2) nγ = 1.482(2)
2V:
Measured: >70° , Calculated: 75°
Max Birefringence:
δ = 0.008
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
and does not take into account mineral colouration.
Surface Relief:
Moderate
Optical Extinction:
X ∧ a ~ 15°; Y = c; Z = b.
Chemical Properties of Yegorovite
Formula:
Na4[Si4O8(OH)4] · 7H2O
IMA Formula:
Na4[Si2O4(OH)2]2 · 7H2O
Elements listed:
Crystallography of Yegorovite
Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P21/b
Cell Parameters:
a = 9.8744(4) Å, b = 12.398(5) Å, c = 14.8973(7) Å
β = 104.675(5)°
β = 104.675(5)°
Ratio:
a:b:c = 0.796 : 1 : 1.202
Unit Cell V:
1764.29 ų
Z:
4
Morphology:
Prismatic to flattened, lamellar crystals.
Twinning:
Polysynthetic twinning is typical.
Crystal Structure
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2x2x2 | 3x3x3 | 4x4x4
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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
---|---|---|---|---|---|---|---|
0012513 | Yegorovite | Zubkova N V, Pekov I V, Pushcharovskii D Y, Kazantsev S S (2009) Crystal structure of yegorovite Na4[Si4O8(OH)4]*7H2O Doklady Earth Sciences 427 814-818 | 2009 | Lovozero alkaline complex, Kola Peninsula, Russia | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
d-spacing | Intensity |
---|---|
7.21 Å | (70) |
6.21 Å | (72) |
4.696 Å | (44) |
4.003 Å | (49) |
3.734 Å | (46) |
3.116 Å | (100) |
2.463 Å | (38) |
Comments:
Palitra pegmatite, Karnasurt mine, Russia. The data are from the type description.
Geological Environment
Paragenetic Mode(s):
Paragenetic Mode | Earliest Age (Ga) |
---|---|
Stage 4b: Highly evolved igneous rocks | >3.0 |
35 : Ultra-alkali and agpaitic igneous rocks |
Type Occurrence of Yegorovite
General Appearance of Type Material:
Tiny colorless to semi-transparent coarse prismatic to flattened, lamellar crystals up to 1mm long, often associated with minor revdite and megacyclite.
Place of Conservation of Type Material:
Fersman Mineralogical Museum, Russian Academy of Sciences, Moscow, Russia.
Geological Setting of Type Material:
Late hydrothermal, low-temperature paragenesis in a peralkaline pegmatite.
Associated Minerals at Type Locality:
Reference:
Pekov, I.V., Zubkova, N.V., Chukanov, N.V., Zadov, A.E., Grishin, V.G., Pushcharovsky, D.Yu. (2010) Yegorovite, Na4[Si4O8(OH)4]•7H2O, a new mineral from the Lovozero alkaline pluton, Kola Peninsula. Geology of Ore Deposits: 52: 584-590.
Synonyms of Yegorovite
Related Minerals - Strunz-mindat Grouping
9.00. | Clino-ferri-holmquistite | ◻{Li2}{Mg3Fe3+2}(Si8O22)(OH)2 |
9.00. | Shkatulkalita | |
9.00. | Alflarsenite | NaCa2Be3Si4O13(OH) · 2H2O |
9.00. | Ferroericssonite | BaFe2+2 Fe3+(Si2O7)O(OH) |
9.00. | Ferrisepiolite | (Fe3+,Fe2+,Mg)4((Si,Fe3+)6O15)(O,OH)2 · 6H2O |
9.00. | Zvyaginite | NaZnNb2Ti[Si2O7]20(OH,F)3(H2O)4 + (x < 1) |
9.00. | Burnettite | CaVAlSiO6 |
9.00. | Mendigite | Mn2Mn2MnCa(Si3O9)2 |
9.00. | Bridgmanite Subgroup | ABSiO3 |
9.00.20 | Rinkite-(Ce) | (Ca3Ce)Na(NaCa)Ti(Si2O7)2(OF)F2 |
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 Yegorovite
mindat.org URL:
https://www.mindat.org/min-38851.html
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Please feel free to link to this page.
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References for Yegorovite
Reference List:
Localities for Yegorovite
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).
Struck out - Mineral was erroneously reported from this locality.
Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).
All localities listed without proper references should be considered as questionable.
All localities listed without proper references should be considered as questionable.
Russia (TL) | |
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Palitra pegmatite, Karnasurt mine, Karnasurt Mountain, Lovozersky District, Murmansk Oblast, Russia