Original paper

La shabaïte-(Nd), Ca(TR)2(U02)(C03)4(OH)2.6H20, nouvelle espèce minérale de Kamoto, Shaba, Zaïre

Deliens, Michel; Piret, Paul

European Journal of Mineralogy Volume 1 Number 1 (1989), p. 85 - 88

6 references

published: Mar 21, 1989

DOI: 10.1127/ejm/01/1/0085

BibTeX file

ArtNo. ESP147050101011, Price: 29.00 €

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Abstract

Abstract Shabaite-(Nd) occurs as pale yellow micaceous flakes and as rosettes on uraninite matrix, associated with other U and REE secondary minerals. Optically biaxial negative, 2Vmeas = 44°, y = 1.600, ß (calc.) = 1.590, α = 1.534. Monoclinic, space group P2, Pm or P2/m, a = 9.208(5), b = 32.09(3), c = 8.335(4) Å, ß = 90.3(1)°, Z = 5, dcalc. = 3.18 g/cm3, dmeas. = 3.13(10) g/cm3. Strongest lines in the X-ray powder pattern [d(Å), I, hkl\ : 15.9 (10) 020, 7.31 (7) 021, 4.17 (7) 002,012, 3.072 (6) 202,300, 4.58 (5) 210. Electron microprobe analyses yield : CaO 5.99, UO3 30.32, Nd2O3 13.58, Sm2O3 5.54, Y2O3 4.91, Dy2O3 2.96, Pr2O3 2.36, La2O3 1.50, Ce2O3 0.50, C02 (C by chromatography) 18.92, H2O (H by chromatography) 13.49, total 100.07 %. Formula : CaO.UO3.(REE)2O3.4CO2.7H2O. The mineral was found in the Cu-Co deposit of East Kamoto, Shaba, Zaire. The name is for the region.

Keywords

new mineral- shabaite-(Nd)carbonateuranylrare earthsKamoto - Zaire