Soddyite
(repeating unit)(UO2)2SiO4·2H2O IMA symbol Sod[1] Strunz classification 9.AK.05 Dana classification 53.03.03.01 Crystal system Orthorhombic Crystal class Dipyramidal (mmm)
H-M symbol: (2/m 2/m 2/m) Space group F ddd Unit cell 1,745.03 ų Identification Color Canary yellow to amber yellow Cleavage Perfect on {001}, good on {111} Mohs scale hardness 3 - 4 Luster Vitreous, greasy, dull Streak Yellow Diaphaneity Transparent, translucent, opaque Density 4.627 Optical properties Biaxial (-) Refractive index nα = 1.650 - 1.654, nβ = 1.685, nγ = 1.699 - 1.715 Birefringence 0.049 - 0.061 Dispersion Relatively weak Ultraviolet fluorescence Weak orange yellow Other characteristics Radioactive
H-M symbol: (2/m 2/m 2/m)
Soddyite is a mineral of uranium. It has yellow crystals and usually mixed with curite in oxidized uranium ores. It is named after the British radiochemist and physicist Frederick Soddy (1877–1956). Soddyite has been a valid species since 1922, following its discovery in the locality of the Shinkolobwe uranium mine in the Haut-Katanga Province of the Democratic Republic of the Congo (DRC).[2][3][4]
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