Línekite
A valid IMA mineral species
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About Línekite
Allan Línek
Formula:
K2Ca3[(UO2)(CO3)3]2 · 8H2O
The water content in línekite is somewhat variable and varies between 7 to 8 H2O pfu. The content obtained from crystal-structure studies is everytime underestimated in the case of línekite (see Plášil et al. 2017).
Colour:
Pale olive to khaki green
Lustre:
Vitreous
Hardness:
2 - 3
Specific Gravity:
2.922 (Calculated)
Crystal System:
Orthorhombic
Name:
Línekite is named after Dr. Allan Línek (1925–1984), a Czech physicist and crystallographer of the Institute of Physics, Academy of Sciences of the Czech Republic, for his significant contribution to structure science.
Known synthetically. Chemically close to braunerite.
Línekite forms from uranium-rich aqueous solutions and its origin is associated with post-mining processes.
Línekite forms from uranium-rich aqueous solutions and its origin is associated with post-mining processes.
Unique Identifiers
Mindat ID:
43587
Long-form identifier:
mindat:1:1:43587:7
GUID
(UUID V4):
(UUID V4):
a4db3965-a757-4749-9f6b-cc05ec24e704
IMA Classification of Línekite
Approved
Approval year:
2013
First published:
2017
Classification of Línekite
5.ED.55
5 : CARBONATES (NITRATES)
E : Uranyl Carbonates
D : UO2:CO3 = 1:3
5 : CARBONATES (NITRATES)
E : Uranyl Carbonates
D : UO2:CO3 = 1:3
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 |
|---|---|---|
| Lnk | 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 Línekite
Vitreous
Transparency:
Transparent
Colour:
Pale olive to khaki green
Streak:
Greenish white to yellowish white
Hardness:
2 - 3 on Mohs scale
Comment:
Estimated
Tenacity:
Brittle
Cleavage:
Perfect
Perfect on {100} and very good cleavage on {010}.
Perfect on {100} and very good cleavage on {010}.
Fracture:
Irregular/Uneven
Density:
2.922 g/cm3 (Calculated)
Optical Data of Línekite
Type:
Biaxial (+)
RI values:
nα = 1.546(2) nβ = 1.550 nγ = 1.562(2)
2V:
Calculated: 60°
Max Birefringence:
δ = 0.016
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:
Low
Chemistry of Línekite
Mindat Formula:
K2Ca3[(UO2)(CO3)3]2 · 8H2O
The water content in línekite is somewhat variable and varies between 7 to 8 H2O pfu. The content obtained from crystal-structure studies is everytime underestimated in the case of línekite (see Plášil et al. 2017).
The water content in línekite is somewhat variable and varies between 7 to 8 H2O pfu. The content obtained from crystal-structure studies is everytime underestimated in the case of línekite (see Plášil et al. 2017).
Crystallography of Línekite
Crystal System:
Orthorhombic
Class (H-M):
mmm (2/m 2/m 2/m) - Dipyramidal
Space Group:
Pnnm
Cell Parameters:
a = 17.0069 Å, b = 18.0273 Å, c = 18.3374 Å
Ratio:
a:b:c = 0.943 : 1 : 1.017
Unit Cell V:
5,622.04 ų (Calculated from Unit Cell)
Morphology:
Tabular, mostly isometric crystals, up to ca. 0.5 mm across: typically in multiple intergrowths.
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 8.506 Å | (100) |
| 6.428 Å | (3) |
| 5.126 Å | (5) |
| 4.586 Å | (2) |
| 4.249 Å | (7) |
| 4.137 Å | (2) |
| 3.543 Å | (2) |
Comments:
From Type Description.
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 7: Great Oxidation Event | <2.4 |
| 47a : [Near-surface hydration of prior minerals] | |
| 47c : [Carbonates, phosphates, borates, nitrates] | |
| 47f : [Uranyl (U⁶⁺) minerals] | |
| Stage 10b: Anthropogenic minerals | <10 Ka |
| 55 : Anthropogenic mine minerals |
Type Occurrence of Línekite
General Appearance of Type Material:
Tabular, mostly isometric crystals, up to ca. 0.5 mm across, typically in multiple intergrowths.
Place of Conservation of Type Material:
Department of Mineralogy and Petrology of the National Museum in Prague, Prague, Czech Republic, catalogue number P1P 2/2012
Empirical Formula of Type Material:
(K1.73Na0.02)Σ1.75(Ca2.97Cu0.02)Σ2.99[(UO2)(CO3)3]2.02(H2O)8.00
Chemical Analysis of Type Material:
| Na2O | 0.06 % |
|---|---|
| K2O | 6.89 % |
| CaO | 14.11 % |
| CuO | 0.12 % |
| UO3 | 48.76 % |
| CO2 (calc.) | 22.51 % |
| H2O (calc.) | 12.20 % |
| Total: | 104.65 % |
Geological Setting of Type Material:
Geschieber vein, Svornost mine, Ja´chymov ore district, Western Bohemia, Czech Republic (50º22’21.5’’N 12º54’42.0’’E)
Associated Minerals at Type Locality:
Reference:
Plášil, J., Čejka, J., Sejkora, J., Hloušek, J., Škoda, R., Novák, M., Dušek, M., Císařová, I., Němec, I., Ederová, J. (2017) Línekite, K2Ca3[(UO2)(CO3)3]2.8H2O, a new uranyl carbonate mineral from Jáchymov, Czech Republic. Journal of Geosciences: 62: 201–213.
Synonyms of Línekite
Common Associates
Associated Minerals Based on Photo Data:
| 10 photos of Línekite associated with Braunerite | K2Ca(UO2)(CO3)3 · 6H2O |
| 5 photos of Línekite associated with Gypsum | CaSO4 · 2H2O |
| 2 photos of Línekite associated with Čejkaite | Na4(UO2)(CO3)3 |
| 2 photos of Línekite associated with Schröckingerite | NaCa3(UO2)(CO3)3(SO4)F · 10H2O |
Related Minerals - Strunz-mindat Grouping
| 5.ED. | Paramarkeyite | Ca2(UO2)(CO3)3 · 5H2O |
| 5.ED. | Pendevilleite-(Y) | Mg2Y3Al(UO2)2(CO3)7(OH)6(H2O)16 |
| 5.ED.05 | Bayleyite | Mg2(UO2)(CO3)3 · 18H2O |
| 5.ED.10 | Swartzite | MgCa(UO2)(CO3)3 · 12H2O |
| 5.ED.15 | Albrechtschraufite | Ca4Mg(UO2)2(CO3)6F2 · 17-18H2O |
| 5.ED.20 | Liebigite | Ca2(UO2)(CO3)3 · 11H2O |
| 5.ED.25 | Rabbittite | Ca3Mg3(UO2)2(CO3)6(OH)4 · 18H2O |
| 5.ED.30 | Andersonite | Na2Ca(UO2)(CO3)3 · 6H2O |
| 5.ED.35 | Grimselite | K3Na(UO2)(CO3)3 · H2O |
| 5.ED.40 | Widenmannite | Pb2(OH)2[(UO2)(CO3)2] |
| 5.ED.45 | Znucalite | Zn10Ca0.83(UO2)0.83(CO3)4(OH)15.31(H2O)5.48 |
| 5.ED.50 | Čejkaite | Na4(UO2)(CO3)3 |
| 5.ED.50 | Agricolaite | K4(UO2)(CO3)3 |
| 5.ED.55 | Braunerite | K2Ca(UO2)(CO3)3 · 6H2O |
| 5.ED.60 | Leószilárdite | Na6Mg(UO2)2(CO3)6 · 6H2O |
| 5.ED.65 | Pseudomarkeyite | Ca8(UO2)4(CO3)12 · 21H2O |
| 5.ED.65 | Markeyite | Ca9(UO2)4(CO3)13 · 28H2O |
| 5.ED.65 | Natromarkeyite | Na2Ca8(UO2)4(CO3)13 · 27H2O |
| 5.ED.70 | Paddlewheelite | MgCa5Cu2(UO2)4(CO3)12(H2O)33 |
Fluorescence of Línekite
Intense greenish yellow luminescence under both short- (254 nm) and long-wave (366 nm) UV radiation
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 Línekite
mindat.org URL:
https://www.mindat.org/min-43587.html
Please feel free to link to this page.
Please feel free to link to this page.
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External Links:
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References for Línekite
Reference List:
Williams, P. A., Hatert, F., Pasero, M., Mills, S. J. (2013) IMA Commission on New Minerals, Nomenclature and Classification. CNMNC Newsletter No. 15. Mineralogical Magazine, 77 (1) 1-12 doi:10.1180/minmag.2013.077.1.01
Localities for Línekite
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.
Czech Republic (TL) | |
| Williams et al. (2013) +2 other references |
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Svornost Mine, Jáchymov, Karlovy Vary District, Karlovy Vary Region, Czech Republic