Metastudtite, UO ₄ . 2H ₂ O, a new mineral from Shinkolobwe, Shaba, Zaire

Mus. R. Afr. Cent., Dep. Geol., Tervuren, Belgium
Univ. Louvain, Belgium

Aggregates of flexible pale yellow fibers. Electron microprobe analysis gave UO ₄ 88.1%. H ₂ O by TGA approximately 10%. Powder data similar to heated studtite (UO ₄ . 4H ₂ O). Orthorhombic, probable space group Immm, a = 6.51(1), b = 8.78(2), c = 4.21(1)Aa, Z = 2, d(calc.) = 4.67 mg/cm ³ . Strongest lines in the X-ray powder pattern are 5.22 (100)(110), 3.54 (80) (101), 4.38 (50)(020) and 3.79 (50)(011). Optically biaxial positive. gamma = 1.760 (parallel to c, fiber axis), beta = 1.658 and alpha = 1.640.--Modified journal abstract.

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