Soddyite

A piece of rock from Swambo in the Democratic Republic of Congo containing yellow crystals of soddyite

General
Category| Nesosilicates
Formula
(repeating unit)| (UO2)2SiO4·2H2O
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 Å³
Identification
Color| Canary yellow to amber yellow
Cleavage| Perfect on {001}, good on {111}
Mohs scale hardness| 3 - 4
|re|er}}| 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

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]

## References

1. ↑ Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine 85 (3): 291–320. doi:10.1180/mgm.2021.43. Bibcode: 2021MinM...85..291W. https://www.cambridge.org/core/journals/mineralogical-magazine/article/imacnmnc-approved-mineral-symbols/62311F45ED37831D78603C6E6B25EE0A.
2. ↑ Webmineral data for soddyite
3. ↑ Mindat information page for Soddyite
4. ↑ Handbook of Mineralogy

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