Markeyite
A valid IMA mineral species
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Formula:
Ca9(UO2)4(CO3)13 · 28H2O
Colour:
Pale yellowish-green
Lustre:
Vitreous, Pearly
Hardness:
1½ - 2
Specific Gravity:
2.68
Crystal System:
Orthorhombic
Member of:
Name:
Named for the type locality, Markey Mine, USA. Pronounced "ma:r 'ki: ait".
New structure type.
Uranyl tricarbonate clusters (UTC) that are linked by Ca–O polyhedra forming thick corrugated heteropolyhedral layers. Included within the layers is an additional disordered CO3 group linking the Ca–O polyhedra. The layers are linked to one another and to interlayer H2O groups only via hydrogen bonds. The structure bears some similarities to that of liebigite.
Uranyl tricarbonate clusters (UTC) that are linked by Ca–O polyhedra forming thick corrugated heteropolyhedral layers. Included within the layers is an additional disordered CO3 group linking the Ca–O polyhedra. The layers are linked to one another and to interlayer H2O groups only via hydrogen bonds. The structure bears some similarities to that of liebigite.
Unique Identifiers
Mindat ID:
51413
Long-form identifier:
mindat:1:1:51413:8
GUID
(UUID V4):
(UUID V4):
9e4ae3bd-62d1-4ac6-9736-62ec37ba9d2e
IMA Classification of Markeyite
Approved
Approval year:
2016
First published:
2018
Classification of Markeyite
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 |
|---|---|---|
| Mk | 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 Markeyite
Vitreous, Pearly
Transparency:
Transparent
Colour:
Pale yellowish-green
Streak:
White
Hardness:
1½ - 2 on Mohs scale
Tenacity:
Brittle
Cleavage:
Perfect
perfect on {001}; good on {100} and {010}
perfect on {001}; good on {100} and {010}
Fracture:
Irregular/Uneven
Density:
2.68(2) g/cm3 (Measured) 2.699 g/cm3 (Calculated)
Comment:
Measured by floatation in a mixture of methylene iodide and toluene
Optical Data of Markeyite
Type:
Biaxial (-)
RI values:
nα = 1.538(2) nβ = 1.542(2) nγ = 1.545(2)
2V:
Measured: 81° (2)
Max Birefringence:
δ = 0.007
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
Dispersion:
r < v (weak)
Pleochroism:
Weak
Comments:
X = light greenish yellow, Y and Z = light yellow (X > Y ≈ Z)
Comments:
Optical orientation is X = c, Y = b, Z = a
Chemistry of Markeyite
Mindat Formula:
Ca9(UO2)4(CO3)13 · 28H2O
Crystallography of Markeyite
Crystal System:
Orthorhombic
Class (H-M):
mmm (2/m 2/m 2/m) - Dipyramidal
Space Group:
Pmmn
Setting:
Pmmn
Cell Parameters:
a = 17.9688(13) Å, b = 18.4705(6) Å, c = 10.1136(4) Å
Ratio:
a:b:c = 0.973 : 1 : 0.548
Unit Cell V:
3356.6 ų
Z:
2
Morphology:
blades, flattened on {001} and elongate on [010], exhibiting the forms {100}, {010}, {001}, {110}, {101}, {011} and {111}
Twinning:
None observed
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 10.12 Å | (69) |
| 6.41 Å | (91) |
| 5.43 Å | (100) |
| 5.07 Å | (33) |
| 4.618 Å | (25) |
| 4.104 Å | (37) |
| 3.984 Å | (34) |
| 2.732 Å | (25) |
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] |
Type Occurrence of Markeyite
Place of Conservation of Type Material:
Cotype material is deposited in the collections of the Natural History Museum, Los Angeles County, 900 Exposition Boulevard, Los Angeles, CA 90007, USA, catalogue numbers 67091 (holotype), 67092, 67093, 67094 and 69095 (cotype), and the Fersman Mineralogi
Empirical Formula of Type Material:
Ca8.91(U1.01O2)4(CO3)13·28H2O
Chemical Analysis of Type Material:
| CaO | 18.60 % |
|---|---|
| UO3 | 42.90 % |
| CO2 calc | 21.30 % |
| H2O calc | 18.78 % |
| Total: | 101.58 % |
Geological Setting of Type Material:
A secondary phase on asphaltum
Reference:
Kampf, A.R., Plášil, J., Kasatkin, A.V., Marty, J., Čejka. J. (2018) Markeyite, a new calcium uranyl carbonate mineral from the Markey mine, San Juan County, Utah, USA. Mineralogical Magazine: 82: 1089-1100.
Synonyms of Markeyite
Relationship of Markeyite to other Species
Member of:
Other Members of this group:
| 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 |
| Pseudomarkeyite | Ca8(UO2)4(CO3)12 · 21H2O | Mon. 2/m : P21/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 | Pseudomarkeyite | Ca8(UO2)4(CO3)12 · 21H2O |
| 5.ED.65 | Natromarkeyite | Na2Ca8(UO2)4(CO3)13 · 27H2O |
| 5.ED.70 | Paddlewheelite | MgCa5Cu2(UO2)4(CO3)12(H2O)33 |
Fluorescence of Markeyite
Bright bluish white under a 405 nm laser
Other Information
Notes:
At room temperature, dissolves very slowly in H2O (minutes) and dissolves immediately with effervescence in dilute HCl.
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 Markeyite
mindat.org URL:
https://www.mindat.org/min-51413.html
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References for Markeyite
Reference List:
Hålenius, Ulf, Hatert, Frédéric, Pasero, Marco, Mills, Stuart J. (2017) IMA Commission on New Minerals, Nomenclature and Classification (CNMNC) Newsletter 35. European Journal of Mineralogy, 29 (1) 149-152 doi:10.1127/ejm/2017/0029-2626
Hålenius, U., Hatert, F., Pasero, M., Mills, S. J. (2017) New minerals and nomenclature modifications approved in 2017, CNMNC Newsletter No 38. Mineralogical Magazine, 81 (4) 1033-1038 doi:10.1180/minmag.2017.081.062
Localities for Markeyite
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) | |
| CNMNC Newsletter No. 35 +2 other references |
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Markey Mine, Red Canyon Mining District, San Juan County, Utah, USA