Uklonskovite
A valid IMA mineral species
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About Uklonskovite
Alexandr S. Uklonskii
Formula:
NaMg(SO4)F · 2H2O
NOTE: Structure solution of an Italian sample gave the formula NaMg(SO4)F.2H2O (Sabelli, 1985). This formula is now accepted as the correct one (IMA 16-J proposal, accepted). A reinvestigation of the type material confirmed the formula (Menchetti et al., 2017).
Colour:
Colourless
Lustre:
Vitreous
Specific Gravity:
2.42
Crystal System:
Monoclinic
Name:
Named in honor of Alexandr Sergeievich Uklonskii (4 November 1888, Gomel, Russian Empire (now Belarus) - 16 February 1972, Tashkent, Uzbek SSR, USSR (now Uzbekistan)), mineralogist and geochemist, Academy of Sciences, Uzbekistan.
Unique Identifiers
Mindat ID:
4084
Long-form identifier:
mindat:1:1:4084:2
IMA Classification of Uklonskovite
Approved
IMA status notes:
Redefined by the IMA
IMA Formula:
NaMg(S6+O4)F·2H2O
First published:
1964
Approval history:
2016: IMA 16-J: formula revised from NaMg(SO4)OH·2H2O to NaMg(SO4)F·2H2O (F instead of OH).
Type description reference:
Classification of Uklonskovite
7.DF.05
7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
D : Sulfates (selenates, etc.) with additional anions, with H2O
F : With large and medium-sized cations
7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
D : Sulfates (selenates, etc.) with additional anions, with H2O
F : With large and medium-sized cations
31.7.2.1
31 : HYDRATED SULFATES CONTAINING HYDROXYL OR HALOGEN
7 : (AB)2(XO4)Zq·xH2O
31 : HYDRATED SULFATES CONTAINING HYDROXYL OR HALOGEN
7 : (AB)2(XO4)Zq·xH2O
25.3.12
25 : Sulphates
3 : Sulphates of Mg
25 : Sulphates
3 : Sulphates of Mg
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 |
|---|---|---|
| Ukl | 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 Uklonskovite
Vitreous
Transparency:
Transparent
Colour:
Colourless
Cleavage:
Imperfect/Fair
One or more parallel to [010].
One or more parallel to [010].
Density:
2.42 g/cm3 (Measured) 2.414 g/cm3 (Calculated)
Optical Data of Uklonskovite
Type:
Biaxial (+)
RI values:
nα = 1.476(1) nγ = 1.500(1)
Max. Birefringence:
δ = 0.024
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:
Moderate (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.
No measured or calculated 2V is on file for this mineral, so the value used here (91°) is estimated from its recorded refractive indices and optic sign, not from a direct 2V measurement.
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.
No measured or calculated 2V is on file for this mineral, so the value used here (91°) is estimated from its recorded refractive indices and optic sign, not from a direct 2V measurement.
Dispersion:
r < v moderate
Chemistry of Uklonskovite
Mindat Formula:
NaMg(SO4)F · 2H2O
NOTE: Structure solution of an Italian sample gave the formula NaMg(SO4)F.2H2O (Sabelli, 1985). This formula is now accepted as the correct one (IMA 16-J proposal, accepted). A reinvestigation of the type material confirmed the formula (Menchetti et al., 2017).
NOTE: Structure solution of an Italian sample gave the formula NaMg(SO4)F.2H2O (Sabelli, 1985). This formula is now accepted as the correct one (IMA 16-J proposal, accepted). A reinvestigation of the type material confirmed the formula (Menchetti et al., 2017).
Element Weights:
Crystallography of Uklonskovite
Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P21/m
Setting:
P21/m
Cell Parameters:
a = 7.202(1) Å, b = 7.214(1) Å, c = 5.734(1) Å
β = 113.23(1)°
β = 113.23(1)°
Ratio:
a:b:c = 0.998 : 1 : 0.795
Unit Cell V:
273.76 ų (Calculated from Unit Cell)
Z:
2
Crystal Structure
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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) |
|---|---|---|---|---|---|---|---|
| 0012084 | Uklonskovite | Sabelli C (1985) Uklonskovite, NaMg(SO4)F*2H2O: new mineralogical data and structure refinement Bulletin de Mineralogie 108 133-138 | 1985 | Cetine mine, Tuscany, Italy | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 3.56 Å | (100) |
| 3.20 Å | (100) |
| 3.018 Å | (100) |
| 2.19 Å | (90) |
| 1.70 Å | (50) |
| 1.58 Å | (80) |
| 5.47 Å | (70) |
| 2.50 Å | (70) |
| 2.41 Å | (70) |
| 2.01 Å | (70) |
| 1.95 Å | (70) |
| 1.75 Å | (70) |
| 1.42 Å | (70) |
| 1.09 Å | (70) |
| 5.01 Å | (60) |
| 3.35 Å | (60) |
| 1.61 Å | (60) |
| 1.45 Å | (60) |
| 1.40 Å | (60) |
| 1.34 Å | (60) |
| 1 33 Å | (60) |
| 1.11 Å | (60) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 7: Great Oxidation Event | <2.4 |
| 47a : [Near-surface hydration of prior minerals] | |
| 47b : [Sulfates and sulfites] | |
| 47g : [Halogen-bearing surface weathering minerals] |
Type Occurrence of Uklonskovite
Place of Conservation of Type Material:
A.E. Fersman Mineralogical Museum, Academy of Sciences, Moscow, Russia, 67132, 67135.
Geological Setting of Type Material:
Occurs at a depth of 80 m in cavities in clays covering a saline layer in Neogene rocks.
Associated Minerals at Type Locality:
Other Language Names for Uklonskovite
Dutch:Uklonskoviet
German:Uklonskovit
Russian:Уклонсковит
Simplified Chinese:羟钠镁矾
Spanish:Uklonskovita
Traditional Chinese:羥鈉鎂礬
Common Associates
Associations Based on Photo Data:
| 5 photos of Uklonskovite associated with Challacolloite | KPb2Cl5 |
| 3 photos of Uklonskovite associated with Pseudoboleite | Pb31Cu24Cl62(OH)48 |
| 2 photos of Uklonskovite associated with Nitratine | NaNO3 |
| 1 photo of Uklonskovite associated with Cotunnite | PbCl2 |
Related Minerals - Strunz-mindat Grouping
| 7.DF. | Siligiite | [Pb(H2O)5(SO4)][Zn9(OH)18] |
| 7.DF. | Alcaparrosaite | K3Ti4+Fe3+(SO4)4O(H2O)2 |
| 7.DF. | Flaggite | Pb4Cu2+4Te6+2(SO4)2O11(OH)2(H2O) |
| 7.DF. | Bairdite | Pb2Cu2+4Te6+2O10(OH)2(SO4) · H2O |
| 7.DF. | Tzeferisite | CaZn8(SO4)2(OH)12Cl2(H2O)9 |
| 7.DF. | Cherokeeite | [Pb2Zn(OH)4](SO4) · H2O |
| 7.DF. | Ammoniomathesiusite | (NH4)5(UO2)4(SO4)4(VO5) · 4H2O |
| 7.DF. | Sigogglinite | [Pb6Zn(OH)8]2(SO4)6 · (H2O)8-x |
| 7.DF.X | Blueridgeite | [Pb8Zn3Cu2+(OH)16](SO4)2(S2O3)2 · 2H2O |
| 7.DF. | Erssonite | Mg7Fe3+2(OH)18[Ca(H2O)6](SO4)2 · 12H2O |
| 7.DF. | Poellmannite | Ca6Al3(OH)18[Na(H2O)6](SO4)2 · 6H2O |
| 7.DF. | Carlsonite | (NH4)5Fe3+3O(SO4)6 · 7H2O |
| 7.DF. | Cuprocherokeeite | [Pb8Zn3Cu2+(OH)16](SO4)4 · 4H2O |
| 7.DF. | Haywoodite | [Pb(H2O)10][Zn12(OH)20(H2O)(SO4)3] |
| 7.DF. | Chromschieffelinite | Pb10Te6+6O20(OH)14(CrO4)(H2O)5 |
| 7.DF.10 | Kainite | KMg(SO4)Cl · 3H2O |
| 7.DF.10 | Kaliochalcite | KCu2(SO4)2[(OH)(H2O)] |
| 7.DF.15 | Natrochalcite | NaCu2(SO4)2(OH) · 2H2O |
| 7.DF.17 | Genplesite | Ca3Sn(SO4)2(OH)6 · 3H2O |
| 7.DF.17 | 'Unnamed (Ba-Sb Silicate-Sulphate-Hydroxide-Hydrate)' | Ba3Sb5+[(Si,S)O3(OH)]2(OH,O)6 · 3H2O |
| 7.DF.20 | Sideronatrite | Na2Fe(SO4)2(OH) · 3H2O |
| 7.DF.20 | Metasideronatrite | Na2Fe(SO4)2(OH) · H2O |
| 7.DF.25 | Fleischerite | Pb3Ge(SO4)2(OH)6 · 3H2O |
| 7.DF.25 | Mallestigite | Pb3Sb5+(SO4)(AsO4)(OH)6 · 3H2O |
| 7.DF.25 | Schaurteite | Ca3Ge(SO4)2(OH)6 · 4H2O |
| 7.DF.25 | Despujolsite | Ca3Mn4+(SO4)2(OH)6 · 3H2O |
| 7.DF.30 | Slavíkite | (H3O+)3Mg6Fe15(SO4)21(OH)18 · 98H2O |
| 7.DF.35 | Metavoltine | K2Na6Fe2+Fe3+6O2(SO4)12 · 18H2O |
| 7.DF.40 | Lannonite | Mg2Ca4Al4(SO4)8F8 · 24H2O |
| 7.DF.40 | Vlodavetsite | AlCa2(SO4)2F2Cl · 4H2O |
| 7.DF.45 | Peretaite | Ca(SbO)4(SO4)2(OH)2 · 2H2O |
| 7.DF.50 | Gordaite | NaZn4(SO4)(OH)6Cl · 6H2O |
| 7.DF.50 | Calamaite | Na2TiO(SO4)2 · 2H2O |
| 7.DF.52 | Huizingite-(Al) | [(NH4)9(SO4)2][(Al,Fe3+)3(OH)2(H2O)4(SO4)6] |
| 7.DF.52 | Scordariite | K8(Fe3+0.67◻0.33)[Fe3+3O(SO4)6]2 · 14H2O |
| 7.DF.55 | Clairite | (NH4)2Fe3(SO4)4(OH)3 · 3H2O |
| 7.DF.55 | Giacovazzoite | K5Fe3+3O(SO4)6 · 10H2O |
| 7.DF.57 | Magnanelliite | K3Fe3+2(SO4)4(OH)(H2O)2 |
| 7.DF.60 | Arzrunite | Cu4Pb2(SO4)(OH)4Cl6 · 2H2O (?) |
| 7.DF.60 | Evdokimovite | Tl4(VO)3(SO4)5(H2O)5 |
| 7.DF.62 | Bridgesite-(Ce) | CaCe2Cu6(SO4)4(OH)12 · 8H2O |
| 7.DF.65 | Elyite | Pb4Cu(SO4)O2(OH)4 · H2O |
| 7.DF.70 | Yecoraite | Fe3+3Bi5(Te6+O4)2(Te4+O3)O9 · 9H2O |
| 7.DF.70 | Lautenthalite | PbCu4(SO4)2(OH)6 · 3H2O |
| 7.DF.75 | Riomarinaite | Bi(SO4)(OH) · H2O |
| 7.DF.80 | Dukeite | Bi3+24Cr6+8O57(OH)6 · 3H2O |
Other Information
Notes:
Practically insoluble in cold water, dissolves in cold, weak HCl.
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 Uklonskovite
mindat.org URL:
https://www.mindat.org/min-4084.html
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References for Uklonskovite
Reference List:
IMA (1967) International Mineralogical Association: Commission on New Minerals and Mineral Names. Mineralogical Magazine and Journal of the Mineralogical Society, 36 (277) 131-136 doi:10.1180/minmag.1967.036.277.20
Sabelli, Cesare (1985) Uklonskovite, NaMg(SO4)F.2H2O : new mineralogical data and structure refinement. Bulletin de la Société française de Minéralogie et de Cristallographie, 108 (2). 133-138 doi:10.3406/bulmi.1985.7862
Localities for Uklonskovite
Showing 11 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.
Chile | |
| Stephan Wolfsried collection |
| Associated to challacolloite in M.E. Ciriotti collection (2005) +1 other reference |
China | |
| Keqin Cai and Ziqiang Qian (1982) +1 other reference |
Greece | |
| Möckel (2000) |
| Rieck (n.d.) | |
Italy | |
| Brizzi G. et al. (1986) +1 other reference |
Russia | |
| Pekov et al. (2015) |
Spain | |
| Navarro et al. (2009) |
UK | |
| Smith et al. (2014) |
| Kemp et al. (2016) | |
Uzbekistan (TL) | |
| Slyusareva (1964) +1 other reference |
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La Compañia Mine, Sierra Gorda, Antofagasta Province, Antofagasta, Chile