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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Please feel free to link to this page.
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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
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).
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 (e.g. from pseudomorphs).
All localities listed without proper references should be considered as questionable.
All localities listed without proper references should be considered as questionable.
USA (TL) | |
| Miyawaki et al. (2019) +1 other reference |
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