Pseudomarkeyite
A valid IMA mineral species
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Formula:
Ca8(UO2)4(CO3)12 · 21H2O
Colour:
Pale green yellow
Lustre:
Vitreous, Pearly
Hardness:
1
Specific Gravity:
2.88
Crystal System:
Monoclinic
Member of:
Name:
Named for its relation to markeyite.
Unique Identifiers
Mindat ID:
53348
Long-form identifier:
mindat:1:1:53348:9
GUID
(UUID V4):
(UUID V4):
1c2d8ab4-a067-45e9-af8e-ce2a94a96b88
IMA Classification of Pseudomarkeyite
Approved
IMA Formula:
Ca8(UO2)4(CO3)12(H2O)18 · 3H2O
Approval year:
2018
First published:
2020
Type description reference:
Classification of Pseudomarkeyite
5.ED.65
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 |
|---|---|---|
| Pmk | 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 Pseudomarkeyite
Vitreous, Pearly
Transparency:
Transparent
Colour:
Pale green yellow
Streak:
White
Hardness:
1 on Mohs scale
Tenacity:
Brittle
Cleavage:
Very Good
Three cleavages: {101} very easy, {010} good, {100} fair
Three cleavages: {101} very easy, {010} good, {100} fair
Fracture:
Step-Like
Density:
2.88(2) g/cm3 (Measured)
Optical Data of Pseudomarkeyite
Type:
Biaxial (-)
RI values:
nα = 1.549(2) nβ = 1.553(2) nγ = 1.557(2)
Max Birefringence:
δ = 0.008
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
Pleochroism:
Non-pleochroic
Chemistry of Pseudomarkeyite
Mindat Formula:
Ca8(UO2)4(CO3)12 · 21H2O
Crystallography of Pseudomarkeyite
Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P21/m
Setting:
P21/m
Cell Parameters:
a = 17.531(3) Å, b = 18.555(3) Å, c = 9.130(3) Å
β = 103.95(3)°
β = 103.95(3)°
Ratio:
a:b:c = 0.945 : 1 : 0.492
Unit Cell V:
2882.3 ų
Z:
2
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 8.73 Å | (86) |
| 6.28 Å | (100) |
| 5.70 Å | (72) |
| 4.65 Å | (80) |
| 4.293 Å | (55) |
| 4.082 Å | (47) |
| 3.973 Å | (25) |
| 2.811 Å | (59) |
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] |
Type Occurrence of Pseudomarkeyite
General Appearance of Type Material:
Twinned tapering blades and tablets to 1 mm.
Place of Conservation of Type Material:
Type material is deposited in the mineralogical collections of the Natural History Museum of Los Angeles County, 900 Exposition Boulevard, Los Angeles, CA 90007, USA, catalogue number 67091.
Reference:
Kampf, A., Olds, T., Plášil, J., Burns, P., Marty, J. (2020). Natromarkeyite and pseudomarkeyite, two new calcium uranyl carbonate minerals from the Markey mine, San Juan County, Utah, USA. Mineralogical Magazine, 84(5), 753-765.
Synonyms of Pseudomarkeyite
Relationship of Pseudomarkeyite to other Species
Member of:
Other Members of this group:
| Markeyite | Ca9(UO2)4(CO3)13 · 28H2O | Orth. mmm (2/m 2/m 2/m) : Pmmn |
| Natromarkeyite | Na2Ca8(UO2)4(CO3)13 · 27H2O | Orth. mmm (2/m 2/m 2/m) : Pmmn |
| Paramarkeyite | Ca2(UO2)(CO3)3 · 5H2O | Mon. 2/m |
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 | 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 | 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 Pseudomarkeyite
Bright bluish white fluorescence (405 nm laser)
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 Pseudomarkeyite
mindat.org URL:
https://www.mindat.org/min-53348.html
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References for Pseudomarkeyite
Reference List:
Miyawaki, Ritsuro, Hålenius, Ulf, Hatert, Frédéric, Pasero, Marco, Mills, Stuart J. (2019) IMA Commission on New Minerals, Nomenclature and Classification (CNMNC) NEWSLETTER 47. European Journal of Mineralogy, 31 (1) 197-202 doi:10.1127/ejm/2019/0031-2839
Localities for Pseudomarkeyite
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.
USA (TL) | |
| Miyawaki et al. (2019) +1 other reference |
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