Abstract
Kamotoïte-(Y) occurs as crusts of elongated bright yellow blades on uraninite matrix. Optically biaxial negative, 2Vcalc. = 87°, γ = 1.731, β = 1.667 and α = 1.604. Monoclinic, space group P21/a, a = 21.22(1), b = 12.93(1), c = 12.39(1) Å, β = 115.3(1)°, Z = 4, dcalc. = 3.94, dmes. = 3.93. Strongest lines in the X-ray powder pattern | d(Å), I, hkl | 6.48 (10) 020, 8.49 (8) 011, 3.054 (6) 402, 40-4 , 3.49 (4) 222 , 22-3, 2.762 (4) 422, 42-4. An analysis with the electron microprobe gave : UO3 63.39, Y2O3 6. 19, Nd2O3 2.36, Gd2O3 2.10, Sm2O3 1.91, Dy2O3 1.64, CO2 (by chromatography) 7.24, H2O (difference between loss at 800 °C and % CO2) 14.30, total 99.13 %. Formula : 4 UO3 (Y,Nd,Gd,Sm,Dy)2O3. 3 CO2. 14.5 H2O. The mineral was found in the Cu-Co deposit of Kamoto, southern Shaba, Zaïre. The name is for the locality.
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