Cobalt(II) selenide

Cobalt(II) selenide
Names
	IUPAC name Cobalt(II) selenide
Identifiers
CAS Number	1307-99-9;
3D model (JSmol)	Interactive image;
ECHA InfoCard	100.013.778
EC Number	215-155-1;
PubChem CID	102108;
CompTox Dashboard (EPA)	DTXSID6061652 ;
	InChI InChI=1S/Co.Se Key: QVYIMIJFGKEJDW-UHFFFAOYSA-N;
	SMILES [Co]=[Se];
Properties
Chemical formula	CoSe
Molar mass	137.89 g/mol
Density	7.65 g/cm3
Melting point	1,055 °C (1,931 °F; 1,328 K)
Solubility in water	Insoluble
Structure
Crystal structure	Hexagonal (NiAs), hP4
Space group	P63/mmc, No. 194
Lattice constant	a = 0.362 nm, b = 0.362 nm, c = 0.52 nm α = 90°, β = 90°, γ = 120°
Formula units (Z)	2
Hazards
	GHS labelling:
Pictograms
Signal word	Danger
Hazard statements	H301, H331, H373, H410
Precautionary statements	P260, P264, P270, P271, P273, P301+P316, P304+P340, P316, P319, P321, P330, P391, P403+P233, P405, P501
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Cobalt(II) selenide is an inorganic compound with the chemical formula CoSe. The mineral form of this compound is known as freboldite. Similar minerals include trogtalite (CoSe₂) and bornhardtite (Co²⁺Co³⁺₂Se₄).