Copper(I) sulfide

Copper(I) sulfide
Names
	IUPAC name Copper(I) sulfide
	Other names Cuprous sulfide; Chalcocite; Copper glance
Identifiers
CAS Number	22205-45-4 ;
3D model (JSmol)	Interactive image;
ChEBI	CHEBI:51114 ;
ChemSpider	8305611 ;
ECHA InfoCard	100.040.751
PubChem CID	10130093; 62755 (chalcocite);
RTECS number	GL8910000;
UNII	349M3C1RS1 ;
CompTox Dashboard (EPA)	DTXSID0041804 ;
	InChI InChI=1S/2Cu.S/q2+1;-2 Key: AQMRBJNRFUQADD-UHFFFAOYSA-N ; InChI=1/2Cu.S/q2+1;-2 Key: AQMRBJNRFUQADD-UHFFFAOYAN;
	SMILES [Cu+].[Cu+].[S-2];
Properties
Chemical formula	Cu2S
Molar mass	159.15 g·mol−1
Appearance	blue to grayish black lustrous solid
Density	5.6 g/cm3
Melting point	1,130 °C (2,070 °F; 1,400 K)
Solubility in water	insoluble
Solubility	insoluble in acetic aciddecomposes in nitric acid and sulfuric acidslightly soluble in hydrochloric acid
Hazards
NFPA 704 (fire diamond)	0 0 0
Flash point	Nonflammable
	NIOSH (US health exposure limits):
PEL (Permissible)	TWA 1 mg/m3 (as Cu)
REL (Recommended)	TWA 1 mg/m3 (as Cu)
IDLH (Immediate danger)	TWA 100 mg/m3 (as Cu)
Safety data sheet (SDS)	Sigma-Aldrich
Related compounds
Other anions	Copper(I) oxide; Copper(I) selenide;
Other cations	Nickel(II) sulfide; Copper(II) sulfide; Zinc sulfide;
	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

Copper(I) sulfide is a copper sulfide, a chemical compound of copper and sulfur. It has the chemical formula of Cu₂S. It is found in nature as the mineral chalcocite. It has a narrow range of stoichiometry ranging from Cu_1.997S to Cu_2.000S. Samples are typically black.