Calcium sulfide

Calcium sulfide
Names
	IUPAC name Calcium sulfide
	Other names Calcium monosulfide,; Hepar calcies,; Sulfurated lime; Oldhamite
Identifiers
CAS Number	20548-54-3 ;
3D model (JSmol)	Interactive image; Interactive image;
ChEBI	CHEBI:81055;
ChemSpider	8373113 ;
ECHA InfoCard	100.039.869
EC Number	243-873-5;
KEGG	C17392 ;
PubChem CID	10197613;
UNII	1MBW07J51Q ;
CompTox Dashboard (EPA)	DTXSID30885140 ;
	InChI InChI=1S/Ca.S/q+2;-2 Key: AGVJBLHVMNHENQ-UHFFFAOYSA-N ; InChI=1/Ca.S/rCaS/c1-2 Key: JGIATAMCQXIDNZ-WSLZQIQFAE; InChI=1/Ca.S/q+2;-2 Key: AGVJBLHVMNHENQ-UHFFFAOYAE;
	SMILES [Ca]=S; [Ca+2].[S-2];
Properties
Chemical formula	CaS
Molar mass	72.143 g/mol
Appearance	white crystals ; hygroscopic
Density	2.59 g/cm3
Melting point	2,525 °C (4,577 °F; 2,798 K)
Solubility in water	Hydrolyses
Solubility	Insoluble in alcohol ; reacts with acid
Refractive index (nD)	2.137
Structure
Crystal structure	Halite (cubic), cF8
Space group	Fm3m, No. 225
Coordination geometry	Octahedral (Ca2+); octahedral (S2−)
Hazards
	Occupational safety and health (OHS/OSH):
Main hazards	Reacts with water to release H2S
	GHS labelling:
Pictograms
Signal word	Warning
Hazard statements	H315, H319, H335, H400
Precautionary statements	P261, P273, P305+P351+P338
NFPA 704 (fire diamond)	2 0 3
Related compounds
Other anions	Calcium oxide
Other cations	Magnesium sulfide; Strontium sulfide; Barium sulfide
Related sulfides	Sodium 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

Calcium sulfide is the chemical compound with the formula CaS. This white material crystallizes in cubes like rock salt. CaS has been studied as a component in a process that would recycle gypsum, a product of flue-gas desulfurization. Like many salts containing sulfide ions, CaS typically has an odour of H₂S, which results from small amount of this gas formed by hydrolysis of the salt.

In terms of its atomic structure, CaS crystallizes in the same motif as sodium chloride indicating that the bonding in this material is highly ionic. The high melting point is also consistent with its description as an ionic solid. In the crystal, each S²⁻ ion is surrounded by an octahedron of six Ca²⁺ ions, and complementarily, each Ca²⁺ ion surrounded by six S²⁻ ions.

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