Silver(I) selenide

Silver(I) selenide
Names
	IUPAC name Silver(I) selenide
	Other names Naumannite ; Argentous selenide
Identifiers
CAS Number	1302-09-6 ;
3D model (JSmol)	Interactive image;
ECHA InfoCard	100.013.727
PubChem CID	6914520;
UNII	QZ0B90W7EQ ;
CompTox Dashboard (EPA)	DTXSID2061644 ;
	InChI InChI=1S/2Ag.Se Key: GNWCVDGUVZRYLC-UHFFFAOYSA-N;
	SMILES [Se].[Ag].[Ag];
Properties
Chemical formula	Ag2Se
Molar mass	294.7 g/mol
Density	8.216 g/cm3, solid
Melting point	896.85 °C (1,646.33 °F; 1,170.00 K)
Solubility in water	insoluble
Band gap	0.15 eV
Structure
Crystal structure	orthorhombic, oP12
Space group	P212121, No. 19
Thermochemistry
Enthalpy of fusion (ΔfH⦵fus)	56.9 J/g
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). verify (what is ?) Infobox references

Silver selenide (Ag₂Se) is the reaction product formed when selenium toning analog silver gelatine photo papers in photographic print toning. The selenium toner contains sodium selenite (Na₂SeO₃) as one of its active ingredients, which is the source of the selenide (Se²⁻) anion combining with the silver in the toning process.

It is found in nature as the mineral naumannite, a comparatively rare silver mineral which has nevertheless become recognized as important silver compound in some low-sulfur silver ores from mines in Nevada and Idaho.

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