Calcium sulfide
General
Systematic name	Calcium (II) sulfide
Other names	N/A
Molecular formula	CaS
Molar mass	72.14 g/mol
Appearance	White crystalline solid
CAS number	*
Properties
Density and phase	2600 kg m-3, solid
Solubility in water	N/A
Melting point	2400 °C (2673 K)
Boiling point
Structure
Coordination geometry	N/A
Crystal structure	Octahedral
Hazards
MSDS	External MSDS
Main hazards	N/A
NFPA 704
Flash point	N/A
R/S statement	R: N/A S: N/A
RTECS number	N/A
Supplementary data page
Structure and properties	N/A
Thermodynamic data	N/A
Spectral data	N/A
Related compounds
Other anions	N/A
Other cations	N/A
Related salts	N/A
Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) Chemical infobox

Calcium sulfide (CaS), also known as calcium monosulfide, hepar calcies, and sulfurated lime, is a white octahedral crystal used in the manufacturing of phosphors, and as an insecticide and fungicide. It is also being studied as a reactant in a process that would recycle gypsum, a product of coal processing that would otherwise be disposed of in landfills.

Reactivity with water

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Calcium sulfide is stable when it is not in contact with water, but when in an aqueous solution it forms two chemicals: Ca(HS)2and Ca(OH)2.

$2CaS+2H\_2O\; =\; Ca(HS)\_2+Ca(OH)\_2$

External links

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Sulfides | Calcium compounds