Soddyite

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Soddyite
Soddyite-201039.jpg
A piece of rock from Swambo in the Democratic Republic of Congo containing yellow crystals of soddyite
General
CategoryNesosilicates
Formula
(repeating unit)
(UO2)2SiO4·2H2O
IMA symbolSod[1]
Strunz classification9.AK.05
Dana classification53.03.03.01
Crystal systemOrthorhombic
Crystal classDipyramidal (mmm)
H-M symbol: (2/m 2/m 2/m)
Space groupF ddd
Unit cell1,745.03 ų
Identification
ColorCanary yellow to amber yellow
CleavagePerfect on {001}, good on {111}
Mohs scale hardness3 - 4
LusterVitreous, greasy, dull
StreakYellow
DiaphaneityTransparent, translucent, opaque
Density4.627
Optical propertiesBiaxial (-)
Refractive indexnα = 1.650 - 1.654, nβ = 1.685, nγ = 1.699 - 1.715
Birefringence0.049 - 0.061
DispersionRelatively weak
Ultraviolet fluorescenceWeak orange yellow
Other characteristicsRadioactive.svg Radioactive

Soddyite is a mineral of uranium. It has yellow crystals and usually mixed with curite in oxidized uranium ores. It is named after Frederick Soddy (1877–1956), british radiochemist and physicist. It's been a valid species since 1922.[2][3][4]

References[edit]

  1. ^ Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine. 85 (3): 291–320. Bibcode:2021MinM...85..291W. doi:10.1180/mgm.2021.43. S2CID 235729616.
  2. ^ Webmineral data for soddyite
  3. ^ Mindat information page for Soddyite
  4. ^ Handbook of Mineralogy