Calcium sulfide is a chemical compound. It is a slightly water-soluble powder that crystallizes into cubes similar to rock salt. The compound has the odor of rotten eggs when moistened.
Calcium sulfide is primarily used in the preparation of luminous paint, varnishes, medicine and in hair removal products. It was also used commonly in the past as an insecticide agriculturally and in home gardens. Calcium sulfide is found as an additive to various lubricants. The compound can be created through a reaction of calcium metal with elemental sulfur. The bonding in calcium sulfide is highly ionic. This factor influences the high melting point of this material.