Mineral Species containing Iridium (Ir)

Element Properties, Isotopic Compositions for Iridium

**Iridium (Ir) Element Properties**
Atomic Mass	192.22
Atomic Number	77
Name Origins	Latin, Iris = "rainbow."
Year Discovered	1803
Discovery Credits	Discovered by S. Tennant at London, UK.
Remarks	Hard, lustrous, silvery metal of the platinum group. Stable to air and water, inert to all acids, but fused NaOH will attack it. Used in special alloys and spark plugs. Diagnostic tests: There are no simple chemical tests for iridium. The element is usually found as an alloy or a sulfide mineral with other platinum group metals. Atomic Absorption Spectroscopy is used for quantitative analysis and Energy Dispersive Analysis of X-rays (EDAX) is used for qualitative 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 %
Ir	190.960584	191	77	37.3000%		Stable
Ir	192.962917	193	77	62.7000%		Stable

Iridium (Ir) Minerals sorted by Descending Weight Percent

Click here for List sorted by Mineral Name

**25 Minerals containing Iridium (Ir) sorted by Descending Weight Percent**
% Ir	Mineral Name	Chemical Formula	MW
91.17 % Ir	Chengdeite	Ir3Fe	632.51
66.71 % Ir	Cuproiridsite	CuIr2S4	576.25
66.13 % Ir	Kashinite	(Ir,Rh)2S3	435.98
63.20 % Ir	Rutheniridosmine	(Ir,Os,Ru)	182.50
55.55 % Ir	Tolovkite	IrSbS	346.04
52.58 % Ir	Iridium #	(Ir,Os,Ru,Pt)	182.79
46.99 % Ir	Inaglyite	PbCu3(Ir,Pt)8S16	2,454.37
45.15 % Ir	Iridarsenite	(Ir,Ru)As2	319.28
44.37 % Ir	Changchengite !	IrBiS	433.27
42.96 % Ir	Shuangfengite	IrTe2	447.42
41.99 % Ir	Ruthenium	(Ru,Ir,Os)	137.33
36.35 % Ir	Mayingite	IrBiTe	528.80
36.10 % Ir	Gaotaiite	Ir3Te8	1,597.46
35.73 % Ir	Xingzhongite	(Pb,Cu,Fe)(Ir,Pt,Rh)2S4	645.53
31.11 % Ir	Hexaferrum !	(Fe,Os,Ru,Ir)	86.51
30.87 % Ir	Iridisite *	(Ir,Cu,Rh,Ni,Pt)S2	186.82
30.24 % Ir	Irarsite	(Ir,Ru,Rh,Pt)AsS	254.29
29.84 % Ir	Bowieite	(Rh,Ir,Pt)1.77S3	342.08
27.00 % Ir	IMA2008-055 !	(Ni,Fe,Ir)	71.19
25.20 % Ir	Osmium #	(Os,Ir)	190.71
16.56 % Ir	Malanite	Cu(Pt,Ir)2S4	580.54
16.48 % Ir	Kingstonite !	(Rh,Ir,Pt)3S4	501.41
12.93 % Ir	Hexamolybdenum !	(Mo,Ru,Fe,Ir,Os)	104.04
10.58 % Ir	Ferrorhodsite	(Fe,Cu)(Rh,Ir,Pt)2S4	417.75
9.57 % Ir	Konderite	PbCu3(Rh,Pt,Ir)8S16	2,007.80

( Bold - Valid Mineral Name)
(* - Mineral Name is Not IMA Approved)
(! - New Dana Classification Number Has Been Changed or Added)
(? - IMA Discredited Mineral Species Name)
(# - Grandfathered as valid)