Calcurmolite
A valid IMA mineral species
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About Calcurmolite
Formula:
Ca[(UO2)3(MoO4)2(OH)4](H2O)~5.0
formerly given as (Ca,Na)2(UO2)3Mo2(O,OH)11·nH2O
Colour:
bright yellow
Hardness:
2 - 3
Crystal System:
Monoclinic
Name:
Named in allusion to its chemical composition, containing CALCium, URanium and MOLybdenum.
Type Locality:
This page provides mineralogical data about Calcurmolite.
Unique Identifiers
Mindat ID:
863
Long-form identifier:
mindat:1:1:863:7
IMA Classification of Calcurmolite
Approved
IMA Formula:
(Ca1-xNax)2(U6+O2)3(Mo6+O4)2(OH)6-x·nH2O
First published:
1959
Type description reference:
Classification of Calcurmolite
7.HB.15
7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
H : Uranium and uranyl molybdates and wolframates
B : With U6+
7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
H : Uranium and uranyl molybdates and wolframates
B : With U6+
49.3.1.1
49 : HYDRATED MOLYBDATES AND TUNGSTATES
3 : Hydrated Molybdates and Tungstates Containing Hydroxyl or Halogen
49 : HYDRATED MOLYBDATES AND TUNGSTATES
3 : Hydrated Molybdates and Tungstates Containing Hydroxyl or Halogen
27.3.11
27 : Sulphites, Chromates, Molybdates and Tungstates
3 : Molybdates
27 : Sulphites, Chromates, Molybdates and Tungstates
3 : Molybdates
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 for Standard |
|---|---|---|
| Cau | 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 Calcurmolite
Optical Data of Calcurmolite
Type:
Biaxial (-)
RI values:
nα = 1.77 nβ = 1.816 - 1.827 nγ = 1.858 - 1.863
2V:
Calculated: 76°
Max. Birefringence:
δ = 0.088 - 0.093
Based on recorded range of RI values above.
Based on recorded range of RI values above.
Interference Colours:
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
Surface Relief:
Very High (positive)
Relative to Canada balsam mounting medium (n ≈ 1.537).
Relative to Canada balsam mounting medium (n ≈ 1.537).
This shows the grain boundary and Becke line effect under plane-polarised
light, based on the contrast between this mineral's average refractive
index and the mounting medium. It does not take into account mineral
colouration.
In focus
Interference Figure:
This shows the idealized biaxial acute bisectrix (Bxa) interference figure
- the conoscopic view for a grain cut perpendicular to the acute bisectrix, using
this mineral's 2V. The two small white dots mark the melatopes - the points
where the two optic axes emerge - and are shown only when they fall within the
field of view. The coloured bands are isochromatics, and the dark bands are
isogyres.
Rotate the stage: at 0°/90° the isogyres form a cross through the melatopes; at 45° they pull apart into curved hyperbolas. That splitting on rotation - absent in a uniaxial figure - is the standard diagnostic test for telling biaxial minerals from uniaxial ones. If 2V is large, the melatopes may fall outside the field of view, as they often do at the microscope too.
Rotate the stage: at 0°/90° the isogyres form a cross through the melatopes; at 45° they pull apart into curved hyperbolas. That splitting on rotation - absent in a uniaxial figure - is the standard diagnostic test for telling biaxial minerals from uniaxial ones. If 2V is large, the melatopes may fall outside the field of view, as they often do at the microscope too.
Dispersion:
r > v distinct
Pleochroism:
Visible
Comments:
X = colorless; Y = pale yellow; Z = yellow
Chemistry of Calcurmolite
Mindat Formula:
Ca[(UO2)3(MoO4)2(OH)4](H2O)~5.0
formerly given as (Ca,Na)2(UO2)3Mo2(O,OH)11·nH2O
formerly given as (Ca,Na)2(UO2)3Mo2(O,OH)11·nH2O
Element Weights:
Crystallography of Calcurmolite
Crystal System:
Monoclinic
Cell Parameters:
a = 16.30(3) Å, b = 25.49(5) Å, c = 19.50(6) Å
β = 90.07°
β = 90.07°
Ratio:
a:b:c = 0.639 : 1 : 0.765
Unit Cell V:
8,101.99 ų (Calculated from Unit Cell)
Comment:
Crystal Data: n.d. Point Group: n.d. Space Group: n.d. Z = n.d.
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 7.80 Å | (100) |
| 3.21 Å | (80) |
| 3.89 Å | (60) |
| 8.33 Å | (50) |
| 1.99 Å | (50) |
| 1.855 Å | (40) |
| 4.29 Å | (30) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 7: Great Oxidation Event | <2.4 |
| 47a : [Near-surface hydration of prior minerals] | |
| 47f : [Uranyl (U⁶⁺) minerals] |
Type Occurrence of Calcurmolite
Place of Conservation of Type Material:
Unknown
Geological Setting of Type Material:
A secondary mineral in the lower oxidized zone of Mo–U deposits.
Other Language Names for Calcurmolite
Common Associates
Associations Based on Photo Data:
| 46 photos of Calcurmolite associated with Umohoite | (UO2)MoO4 · 2H2O |
| 13 photos of Calcurmolite associated with Parauranophane | Ca(UO2)2(SiO3OH)2 · 5H2O |
| 5 photos of Calcurmolite associated with Uranophane | Ca(UO2)2(SiO3OH)2 · 5H2O |
| 4 photos of Calcurmolite associated with Iriginite | (UO2)Mo2O7 · 3H2O |
| 3 photos of Calcurmolite associated with Baryte | BaSO4 |
| 2 photos of Calcurmolite associated with Molybdenite | MoS2 |
| 1 photo of Calcurmolite associated with Compreignacite | K2(UO2)6O4(OH)6 · 7H2O |
| 1 photo of Calcurmolite associated with Sklodowskite | Mg(UO2)2(SiO3OH)2 · 6H2O |
| 1 photo of Calcurmolite associated with Nováčekite | Mg(UO2)2(AsO4)2 · 10H2O |
| 1 photo of Calcurmolite associated with Quartz | SiO2 |
Related Minerals - Strunz-mindat Grouping
| 7.HB.20 | Tengchongite | Ca(UO2)6(MoO4OH)2O2(OH)4 · 9H2O |
| 7.HB.25 | Uranotungstite | (Ba0.35Pb0.27)Σ0.62[(U6+O2)2(W6+0.98Fe3+0.26◻0.75)O4.7(OH)2.5(H2O)1.75](H2O)1.67 |
| 7.HB.25 | Wolfsriedite | Pb[(UO2)2(W6+Fe3+)O7(OH)](H2O)3 |
Radioactivity
Fluorescence of Calcurmolite
Strong yellowish green
Other Information
Notes:
Radioactive
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 Calcurmolite
mindat.org URL:
https://www.mindat.org/min-863.html
Please feel free to link to this page.
Please feel free to link to this page.
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External Links:
Mineral Dealers:
References for Calcurmolite
Reference List:
Frost, Ray L., Čejka, Jiří, Dickfos, Marilla J. (2008) Raman and infrared spectroscopic study of the molybdate‐containing uranyl mineral calcurmolite. Journal of Raman Spectroscopy, 39 (7). 779-785 doi:10.1002/jrs.1897
Localities for Calcurmolite
Showing 11 localities.
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.
Armenia (TL) | |
| American Mineralogist et al. (1964) +3 other references |
China | |
| Chen Zhangru et al. (1986) |
| Chen Zhangru et al. (1990) |
France | |
| Meisser (1994) +1 other reference |
| Deliens (1992) +3 other references |
| Henriot et al. (1998) |
Kazakhstan | |
| Pekov (1998) +1 other reference |
Russia | |
| Pavel M. Kartashov analytical data (2012) |
| Pavel M. Kartashov (n.d.) +1 other reference |
Slovakia | |
| Števko M. (2022) +1 other reference |
USA | |
| Travis Olds collection +1 other reference |
Quick NavTopAbout CalcurmoliteUnique IdentifiersIMA Classification Classification Mineral SymbolsPhysical Properties Optical Data Chemistry Crystallography X-Ray Powder DiffractionGeological EnvironmentType Occurrence Other LanguagesCommon AssociatesStrunz-MindatRadioactivityFluorescence Other InformationInternet Links References Localities Locality List
Majerská valley U occurrence, Čučma, Rožňava District, Košice Region, Slovakia