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Línekite

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About LínekiteHide

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.


Classification of LínekiteHide

Approved
Approval Year:
2013
First Published:
2017

Physical Properties of LínekiteHide

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}.
Fracture:
Irregular/Uneven
Density:
2.922 g/cm3 (Calculated)

Optical Data of LínekiteHide

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.
Surface Relief:
Low

Chemical Properties of LínekiteHide

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).
IMA Formula:
K2Ca3[(UO2)(CO3)3]2 · 7H2O

Crystallography of LínekiteHide

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 DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
8.506(100)
6.428(3)
5.126(5)
4.586(2)
4.249(7)
4.137(2)
3.543(2)
Comments:
From Type Description.

Type Occurrence of LínekiteHide

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:
(K1.73Na0.021.75(Ca2.97Cu0.022.99[(UO2)(CO3)3]2.02(H2O)8.00
Chemical Analysis of Type Material:
Na2O0.06 %
K2O6.89 %
CaO14.11 %
CuO0.12 %
UO348.76 %
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 LínekiteHide

Common AssociatesHide

Associated Minerals Based on Photo Data:
Čejkaite3 photos of Línekite associated with Čejkaite on mindat.org.
Schröckingerite2 photos of Línekite associated with Schröckingerite on mindat.org.

Fluorescence of LínekiteHide

Intense greenish yellow luminescence under both short- (254 nm) and long-wave (366 nm) UV radiation

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for LínekiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Plášil, J., Fejfarová, K., Sejkora, J., Čejka, J., Novák, M., Škoda, R., Hloušek, J., Dušek, M. and Cĺsařová, I. (2013) Línekite, IMA 2012-066. CNMNC Newsletter No. 15, February 2013, page 7; Mineralogical Magazine: 77: 1-12.
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.

Internet Links for LínekiteHide

Localities for LínekiteHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for 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 (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Czech Republic (TL)
 
  • Karlovy Vary Region
    • Krušné Hory Mts (Erzgebirge)
      • Jáchymov District (St Joachimsthal)
        • Jáchymov (St Joachimsthal)
          • Svornost Mine (Einigkeit Mine)
Plášil, J., Fejfarová, K., Sejkora, J., Čejka, J., Novák, M., Škoda, R., Hloušek, J., Dušek, M. and Cĺsařová, I. (2013) Línekite, IMA 2012-066. CNMNC Newsletter No. 15, February 2013, page 7; Mineralogical Magazine, 77, 1-12; 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.
Mineral and/or Locality  
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