Mineral Species containing Selenium (Se)

Element Properties, Isotopic Compositions for Selenium

**Selenium (Se) Element Properties**
Atomic Mass	78.96
Atomic Number	34
Name Origins	Greek, selene = "moon."
Year Discovered	1817
Discovery Credits	Discovered by J. J. Berzelius at Stockholm, Sweden.
Remarks	Obtained as a silvery metallic allotrope or red amorphous powder, which is less stable. Burns in air, unaffected by water, dissolves in concentrated nitric acid and alkalies. Used in photoelectric cells, photocopier drums, solar cells, and semiconductors. Diagnostic tests: Native Se and Se^2-: Selenium and selenides are detected by heating the powdered mineral on charcoal and are detected by a very pronounced smell described as radishes or rotting radishes. If the selenium is present in quantities, the blowpipe test evolves a brownish smoke which deposits a silvery coating of SeO2 near the assay. If this coating is touched with the reducing flame, an azure-blue color is evident. The open tube test, selenium yields a white oxide which crystallizes in radiating prisms on the sides, often tinged with reddish selenium. The coating is volatile and will advance depending on the location of the flame. The closed tube test, selenium volatizes and condenses as black globules fused on the inside of the glass which may have a reddish tint in the thinnest portion of the sublimate. Selenates (SeO₄)^2- and Selenites (SeO₃)^2-: Fuse a sample on charcoal mixed with with soda (Na₂CO₃) and charcoal dust in the reducing flame of the blowpipe. The reduction of SeO₄or SeO₃is detected by the radish odor. The azure blue selenium flame test color may be noticeable.
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 %
Se	119.904048	74	34	0.9000%		Stable
Se	121.903054	75	34	0.0000%	118.5	Days	beta -	0.864	100.00%
Se	122.904271	76	34	9.2000%		Stable
Se	123.902823	77	34	7.6000%		Stable
Se	124.904433	78	34	23.7000%		Stable
Se	125.903314	80	34	49.8000%		Stable
Se	126.905227	82	34	8.8000%		Stable

Selenium (Se) Minerals sorted by Mineral Name

Click here for List sorted by Weight Percent

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**128 Minerals containing Selenium (Se) sorted by Mineral Name**
% Se	Mineral Name	Chemical Formula	MW
39.38 % Se	Schlemaite !	(Cu,[ ])6(Pb,Bi)Se4	824.04
17.96 % Se	Schmiederite	Pb2Cu++2(Se++++O3)(Se++++++O4)(OH)4	879.44
57.36 % Se	Sederholmite	NiSe	137.65
100.00 % Se	Selenium #	Se	78.96
29.00 % Se	Selenojalpaite !	Ag3CuSe2	544.63
8.46 % Se	Selenopolybasite !	[(Ag,Cu)6(Sb,As)2(S,Se)7][Ag9Cu(S,Se)2Se2]	2,378.81
25.47 % Se	Selenostephanite	Ag5Sb(Se,S)4	930.04
23.24 % Se	Skippenite	Bi2Se2(Te,S)	679.60
24.03 % Se	Sophiite	Zn2(SeO3)Cl2	328.64
14.99 % Se	Soucekite	PbCuBi(S,Se)3	632.20
54.70 % Se	Stilleite #	ZnSe	144.35
44.74 % Se	Sudovikovite !	PtSe2	353.00
15.35 % Se	Telluronevskite !	Bi3TeSe2	890.10
28.25 % Se	Tiemannite #	HgSe	279.55
32.31 % Se	Tischendorfite !	Pd8Hg3Se9	2,150.81
72.82 % Se	Trogtalite #	CoSe2	216.85
64.21 % Se	Trustedtite	Ni3Se4	491.91
2.48 % Se	Tsnigriite	Ag9SbTe3(S,Se)3	1,595.01
63.06 % Se	Tyrrellite #	(Cu,Co,Ni)3Se4	500.87
45.31 % Se	Umangite #	Cu3Se2	348.56
59.74 % Se	Verbeekite !	PdSe2	264.34
21.06 % Se	Vihorlatite !	Bi24Se17Te4	6,525.04
0.18 % Se	Vurroite !	Pb20Sn2(Bi,As)22S54Cl6	9,577.60
29.64 % Se	Watkinsonite	PbCu2Bi4(Se,S)8	1,731.55
8.58 % Se	Weibullite #	Pb6Bi8(S,Se)18	3,679.81
64.21 % Se	Wilkmanite	Ni3Se4	491.91
12.55 % Se	Wittite #	Pb3Bi4(S,Se)9	1,886.80

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( 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)