Mineral Species containing Osmium (Os)

Element Properties, Isotopic Compositions for Osmium

**Osmium (Os) Element Properties**
Atomic Mass	190.2
Atomic Number	76
Name Origins	Greek, osme = "smell."
Year Discovered	1803
Discovery Credits	Discovered by S. Tennant at London, UK.
Remarks	Lustrous silvery metal of the platinum group. Unaffected by air, water, and acids, but dissolves in molten alkalis. Smells, due to formation of volatile OsO4. Used in alloys and catalysts. Diagnostic tests: There are no simple chemical tests for osmium. 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 %
Os	183.952488	184	76	0.0200%		Stable
Os	185.95383	186	76	1.5800%	2 x 10¹⁵	Years	alpha	100.0%
Os	186.955741	187	76	1.6000%		Stable
Os	187.95586	188	76	13.3000%		Stable
Os	188.958137	189	76	16.1000%		Stable
Os	189.958436	190	76	26.4000%		Stable
Os	191.961476	192	76	41.0000%		Stable

Osmium (Os) Minerals sorted by Descending Weight Percent

Click here for List sorted by Mineral Name

**10 Minerals containing Osmium (Os) sorted by Descending Weight Percent**
% Os	Mineral Name	Chemical Formula	MW
74.80 % Os	Osmium #	(Os,Ir)	190.71
74.78 % Os	Erlichmanite	OsS2	254.33
51.89 % Os	Osarsite	(Os,Ru)AsS	274.91
44.89 % Os	Omeiite	(Os,Ru)As2	317.76
31.27 % Os	Rutheniridosmine	(Ir,Os,Ru)	182.50
31.22 % Os	Iridium #	(Ir,Os,Ru,Pt)	182.79
17.59 % Os	Hexaferrum !	(Fe,Os,Ru,Ir)	86.51
17.41 % Os	Anduoite	(Ru,Os)As2	273.20
13.85 % Os	Ruthenium	(Ru,Ir,Os)	137.33
5.48 % Os	Hexamolybdenum !	(Mo,Ru,Fe,Ir,Os)	104.04

( 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)