Mineral Species sorted by the element Hf Hafnium (original) (raw)

Hafnium (Hf) Element Properties

Atomic Mass 178.49
Atomic Number 72
Name Origins Latin, Hafnia = "Copenhagen."
Year Discovered 1923
Discovery Credits Discoverd by D. Coster and G. C. von Hevesey at Copenhagen, Denmark.
Remarks Lustrous, silvery, ductile metal. Resists corrosion due to oxide film, but powdered Hf will burn in air. Unaffected by acids (except HF) and alkalis. Used in control rods for nuclear reactors; high temperature alloys and ceramics.Diagnostic tests: there are no simple chemical tests for hafnium. Zirconium minerals commonly contain hafnium. Energy Dispersive Analysis of X-rays (EDAX) is used for qualitative and quantitative analysis.
References Emsley, J., 1991; THE ELEMENTS : Sec. Ed., Clarendon Press, Oxford, 251 p.
See Also WebElements,ChemiCool

Naturally Occurring Isotopes

Symbol Isotope Mass Isotope Nuclide Number Isotope Number Natural Abundance Half-life Half-life Units Decay Mode Decay Mode MeV Decay Mode %
Hf 173.940044 174 72 0.1600% 2.0 x 1015 Years alpha 2.55 100.0%
Hf 175.941406 176 72 5.2100% Stable
Hf 176.943217 177 72 18.6000% Stable
Hf 177.943696 178 72 27.3000% Stable
Hf 178.945812 179 72 13.6300% Stable
Hf 179.946545 180 72 35.1000% Stable

Mineral Species sorted by the element Hf (Hafnium )

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%Hf Mineral Name Chemical Formula MW
58.45%Hf Hafnon HfSiO4 244.28
4.69%Hf Zircon ZrSiO4 190.31
1.10%Hf Allendeite ! Sc4Zr3O12 648.47
0.80%Hf Lakargiite ! CaZrO3 177.87
0.53%Hf Feklichevite ! Na11Ca9(Fe+++,Fe++)2Zr3Nb[Si25O73](OH,H2O,Cl,O)5 3,038.68
0.40%Hf Bobtraillite ! (Na,Ca)13Sr11(Zr,Y,Nb)14Si42B6O132(OH)12•12H2O 6,318.09
0.26%Hf Taseqite ! Na12Sr3Ca6Fe3Zr3NbSi25O73(O,OH,H2O)3Cl2 3,403.45
0.26%Hf Ikranite ! (Na,H3O)15(Ca,Mn,REE)6Fe+++2Zr3([ ],Zr)([ ],Si)Si24O66(O,OH)6Cl•2-3H2O 2,760.39
0.23%Hf Voronkovite ! Na15(Na,Ca,Ce)3(Mn,Ca)3Fe3Zr3Si26O72(OH,O)4Cl•H2O 3,126.11
0.22%Hf Georgbarsanovite ! Na12(Mn,Sr,REE)3Ca6Fe++3Zr3NbSi25O76Cl2•H2O 3,297.19
0.17%Hf Ferrokentbrooksite ! Na15Ca6(Fe,Mn)3Zr3NbSi25O73(O,OH,H2O)3(Cl,F,OH)2 3,231.96
0.14%Hf Marianoite ! Na2Ca4(Nb,Zr)2(Si2O7)2(O,F)4 792.51
0.12%Hf Kochite ! Na2(Na,Ca)4Ca4(Mn,Ca)2Zr2Ti2(Si2O7)4(O,F)4F4 1,505.08
0.10%Hf Dovyrenite ! Ca6Zr[Si2O7]2(OH)4 728.49
0.05%Hf Johnsenite-(Ce) ! Na12(Ce,REE,Sr)3Ca6Mn3Zr3W(Si25O73)(CO3)(OH,Cl)2 3,374.09

(* - Mineral Name Is Not IMA Approved)
(! - New Dana classification added or changed from Danas New Mineralogy)
(? - IMA Discredited Mineral Species Name)

There are 15 minerals with Hf in the Mineralogy Database.