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Mineral Species sorted by the element Os Osmium

  • ️David Barthelmy
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 MeV 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      
 

Mineral Species sorted by the element Os (Osmium )

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%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

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

There are 10 minerals with Os in the Mineralogy Database.