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Hafnium (Hf ) by %

**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 )

Click Here for Mineral Species Sorted By Mineral Name

%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.

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Mineral Species containing Hafnium (Hf )

Hafnium (Hf ) by %

Mineral Species sorted by the element Hf (Hafnium )