Mineral Species containing Hafnium (Hf)

Element Properties, Isotopic Compositions for Hafnium

**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

Hafnium (Hf) Minerals sorted by Mineral Name

Click here for List sorted by Weight Percent

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

( Bold - Valid Mineral Name)
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(! - New Dana Classification Number Has Been Changed or Added)
(? - IMA Discredited Mineral Species Name)
(# - Grandfathered as valid)