Where it forms, where it's found
- Geological setting
Oxidation zones of a U-Mo deposit
- Type locality
- Oktyabr'skoe Mo-U Deposit
- Strel'tsovskoe Mo-U ore field
- Krasnokamensk
- Krasnokamensky District
- Zabaykalsky Krai
- Russia
50.0918°, 118.2496°
2recorded occurrences
Radioactivity
Physical
- Hardness
- 1Talc
- 2Gypsum
- 3Calcite
- 4Fluorite
- 5Apatite
- 6Orthoclase
- 7Quartz
- 8Topaz
- 9Corundum
- 10Diamond
- Transparency
- Translucent
- Colour
- Red-orange · yellow-brown · orange-brown · brown
- Cleavage
- Imperfect/Fair
One direction, pinacoidal.
- Density
- 4.62 g/cm³
Optical
- Optical type
- Biaxial (-)
- Refractive index
- 1.76 – 1.87
- Surface relief
- Very high
- Principal indices
- nα 1.76 · nβ 1.84 · nγ 1.87
- Pleochroism
- Strong
X = Y = deep lemon-yellow; Z = pale yellow to almost colorless
- Dispersion
- r > v
Δ = 0Δmax
PPLpleochroism per grain
XPLindependent extinctions · rotate the stage
PPLpleochroism only · colour blends on rotation
XPLinterference colour · extinct every 90°
Retardation1100 nm
Order2nd order
XPL colour
Crystallography
- Type-locality form
Prismatic to acicular crystals, radial fibrous in spherulites
- Comment
Crystal Data: n.d. Point Group: n.d; Space Group: n.d. Z = n.d.
Chemical composition
Synonyms
- Calciouranoiet
- Calciumuranoit
- Calciumuranoita
- Calciumuranoite
- IMA1973-004
In other languages
- German
- Calciouranoit · IMA 1973-004
- Italian
- Calciouranoite
Classification
Strunz
10th ed.4.GB.20
- 4OxidesClass
- 4.GUranyl HydroxidesDivision
- 4.GBWith additional cations (K, Ca, Ba, Pb, etc.); with mainly UO2(O,OH)5 pentagonal polyhedraGroup
- 4.GB.20CalciouranoiteSpecies
Dana
8th ed.05.04.02.01
- 05Oxides Containing Uranium or ThoriumClass
- 05.04AX2O7·xH2OType
- 05.04.02Uranoite SeriesGroup
- 05.04.02.01CalciouranoiteSpecies
CIM
—7.16.18
- 7Oxides and HydroxidesClass
- 7.16Oxides of UGroup
- 7.16.18CalciouranoiteSpecies
Literature, links & citation
Citations
- 1974Rogova, V.P., Belov, L.N., Kiziyarov, G.N., and Koznetsova, N.N. (1974) Calciouranoite, a new hydroxide of uranium. Zapiski Vsesoyuznogo Mineralogicheskogo Obshchestva, 103, issue 1, 108-109.
- 1975Fleischer, Michael (1975) New mineral names. American Mineralogist, 60 (1-2). 161-163
- 2005(2005) Calciouranoite. Handbook of Mineralogy. Mineralogical Society of America
Cite this entry
@misc{mineral2026,
author = {Mineral Index editorial board},
title = {Calciouranoite — Mineral Index},
year = {2026},
url = {https://mineralindex.org/minerals/calciouranoite-828},
note = {Accessed 2026-05-11}
}