Where it forms, where it's found
- Geological setting
Oxidation zone of a Cu-Co deposit with uranium.
- Type locality
- Kamoto East Open cut
- Kamoto
- Mutshatsha
- Lualaba
- DR Congo
-10.7191°, 25.4180°
7recorded occurrences
Radioactivity
Optical
- Optical type
- Biaxial (-) · 2V measured = 87° · 2V calc = 86°
- Refractive index
- 1.604 – 1.731
- Surface relief
- High
- Principal indices
- nα 1.604 · nβ 1.667 · nγ 1.731
- Pleochroism
- Visible
X = colorless; Y = pale yellow-green; Z = bright yellow.
- Dispersion
- r > v
- Extinction
- X = b; Z = a; Y ∧ c = 25°.
- Notes
Absorption: Z > Y > X.
Δ = 0Δmax
PPLpleochroism per grain
XPLindependent extinctions · rotate the stage
PPLpleochroism only · colour blends on rotation
XPLinterference colour · extinct every 90°
Retardation1270 nm
Order3rd order
XPL colour
Crystallography
- Cell parameters
- a = 12.3525(5) Å · b = 12.9432(5) Å · c = 19.4409(7) Å
- Cell angles
- β = 99.857(3) °
- Ratio a:b:c
- 1 : 1.048 : 1.574
- Unit cell volume
- 3069.8 ų
- Z
- 4
- Type-locality form
Crusts of elongate (to 5 mm), bright yellow blades on uraninite.
- Comment
space group is P21/n
Chemical composition
Synonyms
- IMA1985-051
- Kamotoiet-(Y)
In other languages
- German
- IMA 1985-051 · Kamotoit- · Kamotoit-(Y)
- Italian
- Kamotoite- · Kamotoite-(Y)
Classification
Strunz
10th ed.5.EA.30
- 5CarbonatesClass
- 5.EUranyl CarbonatesDivision
- 5.EAUO2:CO3 > 1:1Group
- 5.EA.30Kamotoite-(Y)Species
Dana
8th ed.16b.03.03.01
- 16bHydrated Carbonates Containing Hydroxyl or HalogenClass
- 16b.03AmBn(XO3)pZq
xH2O & with (m+n):p = 2:1 Type - 16b.03.03— unnamed intermediate level —Group
- 16b.03.03.01Kamotoite-(Y)Species
CIM
—11.11.15
- 11CarbonatesClass
- 11.11Carbonates of Cr and UGroup
- 11.11.15Kamotoite-(Y)Species
Literature, links & citation
Citations
- 1986Deliens, Michel, Piret, Paul (1986) La kamotoïte-(Y), un nouveau carbonate d'uranyle et de terres rares de Kamoto, Shaba, Zaïre. Bulletin de Minéralogie, 109 (6) 643-647 doi:10.3406/bulmi.1986.7966DOI: 10.3406/bulmi.1986.7966
- 1988Hawthorne, Frank C., Burke, Ernst A. J., Ercit, T. Scott, Grew, Edward S., Grice, Joel D., Jambor, John L., Puziewicz, Jacek, Roberts, Andrew C., Vanko, David A. (1988) New Mineral Names. American Mineralogist, 73 (1-2) 189-199
- 1990Deliens, M., Piret, P., Van Der Meersche, E. (1990) Les minéraux secondaires d'uranium du Zaïre, deuxieme complement. Institut royal des sciences naturelles de Belgique, 39 pages.
- 2005(2005) Kamotoite-(Y). Handbook of Mineralogy. Mineralogical Society of America
- 2017Plášil, Jakub, Petříček, Václav (2017) Crystal structure of the (REE)-uranyl carbonate mineral kamotoite-(Y) Mineralogical Magazine, 81 (3) 653-660 doi:10.1180/minmag.2016.080.123DOI: 10.1180/minmag.2016.080.123
Cite this entry
@misc{mineral2026,
author = {Mineral Index editorial board},
title = {Kamotoite-(Y) — Mineral Index},
year = {2026},
url = {https://mineralindex.org/minerals/kamotoite-y-2150},
note = {Accessed 2026-05-11}
}