Čejkaite
A valid IMA mineral species
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About Čejkaite
Jiří Čejka
Formula:
Na4(UO2)(CO3)3
Colour:
pale yellow to beige
Lustre:
Vitreous
Specific Gravity:
3.67
Crystal System:
Monoclinic
Name:
In honour of Dr. Jiří Čejka (born 1929), Czech mineralogist, former Director, National Museum, Prague, Czech Republic, now retired (2009). Dr. Čejka specialized in spectrography and the study of uranium minerals. He had earlier published a study on the thermal decomposition of the synthetic analog of this mineral.
This page provides mineralogical data about Čejkaite.
Unique Identifiers
Mindat ID:
7105
Long-form identifier:
mindat:1:1:7105:1
GUID
(UUID V4):
(UUID V4):
06ffa611-fb97-4511-8bae-5e150231ce85
IMA Classification of Čejkaite
Approved
Approval year:
1999
First published:
2003
Approval history:
IMA1999-045
Classification of Čejkaite
5.ED.50
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 |
|---|---|---|
| Čej | 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 Čejkaite
Vitreous
Colour:
pale yellow to beige
Streak:
light yellow
Density:
3.67 g/cm3 (Measured) 3.74 g/cm3 (Calculated)
Comment:
Calculated density from Plášil et al. (2013).
Chemistry of Čejkaite
Mindat Formula:
Na4(UO2)(CO3)3
Elements listed:
Crystallography of Čejkaite
Crystal System:
Monoclinic
Class (H-M):
m - Domatic
Space Group:
Bb
Setting:
Cc
Cell Parameters:
a = 9.2919(8) Å, b = 16.0991(11) Å, c = 6.4436(3) Å
α = 90°, β = 91.404(5)°, γ = 90°
α = 90°, β = 91.404(5)°, γ = 90°
Ratio:
a:b:c = 0.577 : 1 : 0.4
Unit Cell V:
963.62 ų
Z:
4
Comment:
Cell data from Plášil et al. (2013).
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 8.058 Å | (42) |
| 5.084 Å | (31) |
| 5.029 Å | (41) |
| 4.971 Å | (47) |
| 4.647 Å | (100) |
| 3.220 Å | (35) |
| 2.6839 Å | (43) |
| 2.3241 Å | (30) |
| 1.7565 Å | (39) |
Comments:
From Plášil et al. (2013).
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 7: Great Oxidation Event | <2.4 |
| 47c : [Carbonates, phosphates, borates, nitrates] | |
| 47f : [Uranyl (U⁶⁺) minerals] | |
| 47h : [Near-surface oxidized, dehydrated minerals] |
Type Occurrence of Čejkaite
General Appearance of Type Material:
Thin earthy efflorescence. Crystals range from 0.2 to 0.6 um.
Place of Conservation of Type Material:
National Museum, Prague, Czech Republic (P1p 17/99).
Geological Setting of Type Material:
Secondary mineral in a uranium deposit. Forms at pH > 6.5.
Associated Minerals at Type Locality:
Reference:
Ondrus, P., Skala, R., Veselovsky, F., Sejkora, J., Vitti, C. (2003) Čejkaite, the triclinic polymorph of Na4(UO2)(CO3)3 - a new mineral from Jachymov, Czech Republic. American Minereralogist: 88: 686-693.
Synonyms of Čejkaite
Other Language Names for Čejkaite
Common Associates
Associated Minerals Based on Photo Data:
| 10 photos of Čejkaite associated with Grimselite | K3Na(UO2)(CO3)3 · H2O |
| 6 photos of Čejkaite associated with Andersonite | Na2Ca(UO2)(CO3)3 · 6H2O |
| 2 photos of Čejkaite associated with Línekite | K2Ca3[(UO2)(CO3)3]2 · 8H2O |
| 2 photos of Čejkaite associated with Malachite | Cu2(CO3)(OH)2 |
| 2 photos of Čejkaite associated with Apexite | NaMg(PO4) · 9H2O |
| 2 photos of Čejkaite associated with Calcite | CaCO3 |
| 1 photo of Čejkaite associated with Quartz | SiO2 |
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 | Agricolaite | K4(UO2)(CO3)3 |
| 5.ED.55 | Línekite | K2Ca3[(UO2)(CO3)3]2 · 8H2O |
| 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 Čejkaite
Weak yellow to yellow-green in SW and LW UV.
Other Information
Notes:
Readily soluble with effervescence in diluted acids and even soluble in water with pH < 6.5.
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 Čejkaite
mindat.org URL:
https://www.mindat.org/min-7105.html
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References for Čejkaite
Reference List:
Ondruš, Petr, Skála, Roman, Veselovský, Františsek, Sejkora, Jiří, Vitti, Cecilia (2003) Čejkaite, the triclinic polymorph of Na4(UO2)(CO3)3—a new mineral from Jáchymov, Czech Republic. American Mineralogist, 88 (4) 686-693 doi:10.2138/am-2003-0422
Burns, Peter C. (2005) U6+ minerals and inorganic compounds: insights into an expanded structural hierarchy of crystal structures. The Canadian Mineralogist, 43 (6) 1839-1894 doi:10.2113/gscanmin.43.6.1839
Čejka, Jiří, Sejkora, Jiří, Plášil, Jakub, Bahfenne, Silmarilly, Palmer, Sara J., Frost, Ray L. (2009) Raman spectroscopic study of the uranyl carbonate mineral čejkaite and its comparison with synthetic trigonal Na4[UO2(CO3)3]. Journal of Raman Spectroscopy, 41 (4) 459-464 doi:10.1002/jrs.2349
Localities for Čejkaite
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 | |
| American Mineralogist: 84: 688. |
| Tvrdý et al. (2010) | |
| Plášil J. et al. (2013) | |
| Excalibur Mineral Co. specimens | |
| Ondruš et al. (2003) |
| Collection of Alex Earl |
| Bull. mineral.-petrolog. Odd. Nár. Muz. (Praha) |
| Sejkora +1 other reference | |
Hungary | |
| Szakáll |
Spain | |
| Eureka blogspot +1 other reference |
Ukraine | |
| Burakov et al. () +1 other reference |
USA | |
| Tony Nikischer +1 other reference |
| Travis Olds collection +1 other reference |
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Svornost Mine, Jáchymov, Karlovy Vary District, Karlovy Vary Region, Czech Republic