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Markeyite

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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
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.


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Classification of MarkeyiteHide

Approved
Approval Year:
2016
First Published:
2018

Physical Properties of MarkeyiteHide

Vitreous, Pearly
Transparency:
Transparent
Colour:
Pale yellowish-green
Hardness:
1½ - 2 on Mohs scale
Tenacity:
Brittle
Cleavage:
Perfect
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 MarkeyiteHide

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.
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

Chemical Properties of MarkeyiteHide

Formula:
Ca9(UO2)4(CO3)13·28H2O
IMA Formula:
Ca9(UO2)4(CO3)13 · 28H2O

Crystallography of MarkeyiteHide

Crystal System:
Orthorhombic
Class (H-M):
mmm (2/m 2/m 2/m) - Dipyramidal
Space Group:
Pmmn
Setting:
Pmmn
Cell Parameters:
b = 18.4705(6) Å
Ratio:
a:b:c = 1
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}

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
10.12(69)
6.41(91)
5.43(100)
5.07(33)
4.618(25)
4.104(37)
3.984(34)
2.732(25)
Comments:
From Type Description.

Type Occurrence of MarkeyiteHide

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
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 MarkeyiteHide

Fluorescence of MarkeyiteHide

Bright bluish white under a 405 nm laser

Other InformationHide

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.

References for MarkeyiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Kampf, A.R., Plášil, J., Kasatkin, A.V., Marty, J. and Čejka, J. (2017) Markeyite, IMA 2016-090. CNMNC Newsletter No. 35, February 2017, page 211; Mineralogical Magazine 81: 209–213.
IMA Newsletter 38 (revision of formula)
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.

Internet Links for MarkeyiteHide

Localities for MarkeyiteHide

ⓘ - 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.
USA (TL)
 
  • Utah
    • San Juan Co.
      • White Canyon District
        • Red Canyon
Kampf, A.R., Plášil, J., Kasatkin, A.V., Marty, J. and Čejka, J. (2017) Markeyite, IMA 2016-090. CNMNC Newsletter No. 35, February 2017, page 211; Mineralogical Magazine, 81, 209–213.
Mineral and/or Locality  
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