Abstract
A new uranium mineral, named ranquilite, has been found in Mendoza Province, Argentina. The probable formula is 1.5CaO · 2UO35SiO2 · 12H2O. The orthorhombic unit cell has a0= 17.64 Å, b0= 14.28 Å and c0=18.48 Å. Z. = 8, G. = 3.32. Samples heated to 110-120° and to 130-140° C. show certain changes in the x-ray powder pattern suggesting two lower hydrates. After exposure to the air, the original pattern is again obtained.
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