Log In
Slyudyankaite
A valid IMA mineral species
This page is currently not sponsored. Click here to sponsor this page.
About Slyudyankaite
Formula:
Na28Ca4(Si24Al24O96)(SO4)6(S6)1/3(CO2) · 2H2O
Colour:
Green to pale blue
Lustre:
Vitreous
Hardness:
5½
Specific Gravity:
2.46
Crystal System:
Triclinic
Member of:
Name:
After the area of the famous Slyudyanka geological site/quarry, Russia, the type locality. The species was earlier referred to as earlier described as “triclinic lazurite”.
A very unique mineral: the first species with the hexasulfur moiety (likely not a hexasulfide, as the moiety is neutral). One of very few minerals bearing CO2 in their structure.
The structure contains two types of sodalite cages in a ratio of 3:1. The first type contains only SO42– anions and extra-framework cations. The second type contains only neutral molecules (S6, CO2, H2O, and minor S4).
The structure contains two types of sodalite cages in a ratio of 3:1. The first type contains only SO42– anions and extra-framework cations. The second type contains only neutral molecules (S6, CO2, H2O, and minor S4).
Unique Identifiers
Mindat ID:
55752
Long-form identifier:
mindat:1:1:55752:2
IMA Classification of Slyudyankaite
Classification of Slyudyankaite
9.FB.
9 : SILICATES (Germanates)
F : Tektosilicates without zeolitic H2O
B : Tektosilicates with additional anions
9 : SILICATES (Germanates)
F : Tektosilicates without zeolitic H2O
B : Tektosilicates with additional anions
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 |
|---|---|---|
| Sdy | 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 Slyudyankaite
Vitreous
Colour:
Green to pale blue
Streak:
White
Hardness:
5½ on Mohs scale
Tenacity:
Brittle
Cleavage:
None Observed
Parting:
None observed.
Fracture:
Irregular/Uneven
Density:
2.46(2) g/cm3 (Measured) 2.454 g/cm3 (Calculated)
Comment:
Measured in heavy liquids. Calculated using the empirical formula.
Optical Data of Slyudyankaite
Type:
Biaxial (+)
RI values:
nα = 1.506(1) nβ = 1.509(1) nγ = 1.513(1)
2V:
Measured: 80° (10), Calculated: 82°
Max. Birefringence:
δ = 0.007
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:
Low (negative)
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:
Distinct.
Optical Extinction:
Orientation could not be determined because of the absence of cleavage and crystal forms.
Pleochroism:
Strong
Comments:
X = colorless; Y = green; Z = greenish-blue.
Comments:
Absorption: X < Y < Z.
Chemistry of Slyudyankaite
Mindat Formula:
Na28Ca4(Si24Al24O96)(SO4)6(S6)1/3(CO2) · 2H2O
Element Weights:
Chemical Analysis
Oxide wt%:
| 1 | |
|---|---|
| Na2O | 19.28 % |
| K2O | 0.12 % |
| CaO | 5.13 % |
| Al2O3 | 27.01 % |
| SiO2 | 33.25 % |
| SO3 | 10.94 % |
| S | 1.75 % |
| Cl | 0.10 % |
| CO2 | 1.42 % |
| H2O | 0.90 % |
| –O?(Cl,HS) | -0.03 % |
| total | 99.87 % |
| Total: | 199.74 % |
Empirical formulas:
| Sample ID | Empirical Formula |
|---|---|
| 1 | Na27.57Ca4.05K0.11(Si24.52Al23.48O96)(SO4)6.06S02.42Cl0.12(CO2)1 · 43 · 2.21H2O |
Sample references:
| ID | Locality | Reference | Notes |
|---|---|---|---|
| 1 | Malo-Bystrinskoe lazurite deposit, Malaya Bystraya River Valley, Slyudyansky District, Irkutsk Oblast, Russia | via (1) electron microprobe; (2) H2O and CO2 via selective sorption of ignition products; (3) CO2 confirmed via quantitative IR spectroscopy; (4) sulfate sulfur determined via wet chemical analysis; "S0" = total sulfide sulfur (mainly neutral S6 and minor S4 molecules) |
Crystallography of Slyudyankaite
Crystal System:
Triclinic
Class (H-M):
1 - Pedial
Space Group:
P1
Cell Parameters:
a = 9.0523(4) Å, b = 12.8806(6) Å, c = 25.681(1) Å
α = 89.988(2)°, β = 90.052(1)°, γ = 90.221(1)°
α = 89.988(2)°, β = 90.052(1)°, γ = 90.221(1)°
Ratio:
a:b:c = 0.703 : 1 : 1.994
Unit Cell V:
2,994.36 ų (Calculated from Unit Cell)
Z:
1
Morphology:
Anhedral.
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 6.45 Å | (11) |
| 3.716 Å | (100) |
| 2.878 Å | (12) |
| 2.625 Å | (23) |
| 2.431 Å | (6) |
| 2.275 Å | (6) |
| 2.143 Å | (12) |
| 1.784 Å | (7) |
Comments:
Malo-Bystrinskoe lazurite deposit, Baikal Lake area, Russia. The data are from the type description.
Type Occurrence of Slyudyankaite
General Appearance of Type Material:
Green to pale blue isolated anhedral equant grains up to 0.5 cm across and their aggregates.
Place of Conservation of Type Material:
Collections of the Sidorov Mineralogical Museum (INRTU), Lermontova St. 83, Irkutsk 664074, Russia, registration numbers MMU/MF27296 (holotype) and MMU/MF 27297 (cotype).
Geological Setting of Type Material:
Altered lazurite-bearing metasomatic rock.
Associated Minerals at Type Locality:
Synonyms of Slyudyankaite
Other Language Names for Slyudyankaite
Dutch:Slyudyankaiet
German:Slyudyankait
Relationship of Slyudyankaite to other Species
Member of:
Other Members of Sodalite Group:
| Bolotinaite | (Na7◻)(Al6Si6O24)F · 4H2O | Iso. 43m : I43m |
| Haüyne | Na3Ca(Si3Al3)O12(SO4) | Iso. 43m : P43n |
| Lazurite | Na7Ca(Al6Si6O24)(SO4)(S3) · H2O | Iso. 43m : P43n |
| Nosean | Na8(Al6Si6O24)(SO4) · H2O | Iso. 43m : P43n |
| Sapozhnikovite | Na8(Al6Si6O24)(HS)2 | Iso. 43m : P43n |
| Sodalite | Na4(Si3Al3)O12Cl | Iso. 43m : P43n |
| Tsaregorodtsevite | (N(CH3)4)(AlSi5O12) | Orth. 222 : I222 |
| Vladimirivanovite | Na6Ca2(Al6Si6O24)(SO4,S3,S2,Cl)2 · H2O | Orth. mmm(2/m2/m2/m) |
Related Minerals - Strunz-mindat Grouping
| 9.FB. | Perchukite-(Y) | PbYAsSi2O8 |
| 9.FB. | Åsgruvanite-(Ce) | Ce16Ca5Al(SiO4)6(AsO3)8(CO3)2Cl4F3(OH)2 |
| 9.FB. | Steudelite | Na3(K17Ca7)Ca4(Al24Si24O96)(SO3)6F6 · 4H2O |
| 9.FB. | Wenlanzhangite-(Y) | Y2V3+2V4+2(SiO4)2O4(OH)4 |
| 9.FB. | Bolotinaite | (Na7◻)(Al6Si6O24)F · 4H2O |
| 9.FB. | Sapozhnikovite | Na8(Al6Si6O24)(HS)2 |
| 9.FB. | Betzite | Na6Ca2(Al6Si6O24)Cl4 |
| 9.FB.05 | Quadridavyne | (Na,K)6Ca2(Al6Si6O24)Cl4 |
| 9.FB.05 | Sulfhydrylbystrite | Na5K2Ca[Al6Si6O24](S5)2(SH) |
| 9.FB.05 | Marinellite | (Na,K)42Ca6(Al6Si6O24)6(SO4)8Cl2 · 3H2O |
| 9.FB.05 | Afghanite | (Na,K)22Ca10(Si24Al24O96)(SO4)6Cl6 |
| 9.FB.05 | Bystrite | (Na,K)7Ca(Al6Si6O24)(S5)Cl |
| 9.FB.05 | Franzinite | (Na,K)6Ca2(Al6Si6O24)(SO4)2 · 0.5H2O |
| 9.FB.05 | Kyanoxalite | Na7(Al6-xSi6+xO24)(C2O4)0.5+x · 5H2O (0 < x < 0.5) |
| 9.FB.05 | Vishnevite | (Na,K)8(Al6Si6O24)(SO4,CO3) · 2H2O |
| 9.FB.05 | Farneseite | (Na,Ca,K)56(Al6Si6O24)7(SO4)12 · 6H2O |
| 9.FB.05 | Alloriite | (Na,Ca,K)26Ca4(Al6Si6O24)4(SO4)6Cl6 |
| 9.FB.05 | Liottite | (Na,K)16Ca8(Al6Si6O24)3(SO4)5Cl4 |
| 9.FB.05 | Depmeierite | Na8(Al6Si6O24)(PO4,CO3)1-x · 3H2O (x<0.5) |
| 9.FB.05 | Biachellaite | (Na,Ca,K)8(Al6Si6O24)(SO4)2(OH)0.5 · H2O |
| 9.FB.05 | Cancrinite | (Na,Ca,◻)8(Al6Si6O24)(CO3,SO4)2 · 2H2O |
| 9.FB.05 | Cancrisilite | Na7(Al5Si7O24)(CO3) · 3H2O |
| 9.FB.05 | Fantappièite | [Na82.5Ca33K16.5](Si99Al99O396)(SO4)33 · 4H2O |
| 9.FB.05 | Carbobystrite | Na8(Al6Si6O24)(CO3) · 3.5H2O |
| 9.FB.05 | Microsommite | Na4K2Ca2(Al6Si6O24)(SO4)Cl2 |
| 9.FB.05 | Pitiglianoite | Na6K2(Al6Si6O24)(SO4) · 2H2O |
| 9.FB.05 | Tounkite | (Na,Ca,K)8(Si6Al6)O24(SO4)2Cl · 0.5H2O |
| 9.FB.05 | Balliranoite | (Na,K)6Ca2(Si6Al6O24)Cl2(CO3) |
| 9.FB.05 | Giuseppettite | (Na,K,Ca)7-8(Al6Si6O24)(SO4,Cl)1-2 |
| 9.FB.05 | Sacrofanite | (Na61K19Ca32)(Si84Al84O336)(SO4)26Cl2F6 · 2H2O |
| 9.FB.05 | Kircherite | Na5Ca2K(Al6Si6O24)(SO4)2 · 0.33H2O |
| 9.FB.05 | Hydroxycancrinite | Na8(Al6Si6O24)(OH)2 · 2H2O |
| 9.FB.05 | Davyne | (Na,K)6Ca2(Al6Si6O24)(Cl2,SO4)2 |
| 9.FB.10 | Haüyne | Na3Ca(Si3Al3)O12(SO4) |
| 9.FB.10 | Lazurite | Na7Ca(Al6Si6O24)(SO4)(S3) · H2O |
| 9.FB.10 | Danalite | Be3Fe2+4(SiO4)3S |
| 9.FB.10 | Helvine | Be3Mn2+4(SiO4)3S |
| 9.FB.10 | Kamaishilite | Ca2(Al2SiO6)(OH)2 |
| 9.FB.10 | Sodalite | Na4(Si3Al3)O12Cl |
| 9.FB.10 | Nosean | Na8(Al6Si6O24)(SO4) · H2O |
| 9.FB.10 | Genthelvite | Be3Zn4(SiO4)3S |
| 9.FB.10 | Bicchulite | Ca2(Al2SiO6)(OH)2 |
| 9.FB.10 | Tsaregorodtsevite | (N(CH3)4)(AlSi5O12) |
| 9.FB.10 | Vladimirivanovite | Na6Ca2(Al6Si6O24)(SO4,S3,S2,Cl)2 · H2O |
| 9.FB.10 | Tugtupite | (BeAlSi)Na4(SiO4)3Cl |
| 9.FB.15 | Marialite | Na4Al3Si9O24Cl |
| 9.FB.15 | Meionite | Ca4Al6Si6O24CO3 |
| 9.FB.15 | Silvialite | (Ca,Na)4(Al6Si6O24)(SO4,CO3) |
Fluorescence of Slyudyankaite
Not fluorescent.
Other Information
Notes:
The type description provides data for IR, Raman, ESR, near infrared (NIR), visible (Vis) and ultraviolet (UV) absorption, XPS and photoluminescence spectroscopy.
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 Slyudyankaite
mindat.org URL:
https://www.mindat.org/min-55752.html
Please feel free to link to this page.
Please feel free to link to this page.
Search Engines:
External Links:
Mineral Dealers:
References for Slyudyankaite
Localities for Slyudyankaite
Showing 1 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 (TL) | |
| Miyawaki et al. (2022) +1 other reference |
Quick NavTopAbout SlyudyankaiteUnique IdentifiersIMA Classification Classification Mineral SymbolsPhysical Properties Optical Data Chemistry Chemical AnalysisCrystallography X-Ray Powder DiffractionType Occurrence SynonymsOther LanguagesRelationshipsStrunz-MindatFluorescence Other InformationInternet Links References Localities Locality List
Malo-Bystrinskoe lazurite deposit, Malaya Bystraya River Valley, Slyudyansky District, Irkutsk Oblast, Russia