Where it forms, where it's found
- Type locality
- Oktyabr'skoe Mo-U Deposit
- Strel'tsovskoe Mo-U ore field
- Krasnokamensk
- Krasnokamensky District
- Zabaykalsky Krai
- Russia
50.0918°, 118.2496°
1recorded occurrences
Radioactivity
Physical
- Transparency
- Transparent
- Colour
- Orange
- Density
- 4.90 g/cm³
Optical
- Optical type
- Biaxial (+) · 2V measured = 81° · 2V calc = 80°
- Refractive index
- 1.897 – 1.932
- Surface relief
- Very high
- Principal indices
- nα 1.897 · nβ 1.911 · nγ 1.932
- Dispersion
- r > v extreme
Δ = 0Δmax
PPLpleochroism per grain
XPLindependent extinctions · rotate the stage
PPLpleochroism only · colour blends on rotation
XPLinterference colour · extinct every 90°
Retardation350 nm
Order1st order
XPL colour
Crystallography
- Type-locality form
dense, fine-grained aggregate
- Comment
Crystal Data: n.d. Point Group: n.d; Space Group: n.d. Z == n.d
Chemical composition
Synonyms
- IMA1971-054
- Metacalciouranoiet
In other languages
- German
- IMA 1971-054 · Metacalciouranoit
- Italian
- Metacalciouranoite
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.20MetacalciouranoiteSpecies
Dana
8th ed.05.04.03.01
- 05Oxides Containing Uranium or ThoriumClass
- 05.04AX2O7·xH2OType
- 05.04.03— unnamed intermediate level —Group
- 05.04.03.01MetacalciouranoiteSpecies
CIM
—7.16.17
- 7Oxides and HydroxidesClass
- 7.16Oxides of UGroup
- 7.16.17MetacalciouranoiteSpecies
Literature, links & citation
Citations
- 1973Fleischer, Michael (1973) New mineral names. American Mineralogist, 58 (11-12) 1111-1115
- 1973Rogova, V.P., Belova, L.N., Kiziyarov, G.N., Kuznetsova, N.N. (1973) Bauranoite and metacaltsuranoite [metacalciouranoite] - new minerals of the group of hydrous uranium oxides. Zapiski Vsesoyuznogo Mineralogicheskogo Obshchestva: 102(1): 75-81.
- 1985Belova, L.N., Ryzhov, B.I., Fedorov, O.V., Lyubomilova, G.V. (1985) Typomorphism and isomorphism of the wölsendorfite group of uranium hydroxides. Izvestiya Akademii Nauk SSSR, Seriya Geologicheskaya: 1985(2): 65-72.
- 2007(2007) Metacalciouranoite. Handbook of Mineralogy. Mineralogical Society of America
Cite this entry
@misc{mineral2026,
author = {Mineral Index editorial board},
title = {Metacalciouranoite — Mineral Index},
year = {2026},
url = {https://mineralindex.org/minerals/metacalciouranoite-2669},
note = {Accessed 2026-05-11}
}