Copper sulfide, also known as cupric sulfide, is a chemical compound with the formula CuS. It is a black or dark gray solid that is insoluble in water. Copper sulfide occurs naturally in nature as the mineral chalcocite, and it can also be produced synthetically.

Properties of copper sulfide:

* Appearance: black or dark gray solid

* Chemical formula: CuS

* Molecular weight: 95.61 g/mol

* Density: 5.56 g/cm³

* Melting point: 1,130 °C (2,066 °F)

* Boiling point: 1,246 °C (2,275 °F)

* Solubility in water: insoluble

* Electrical conductivity: semiconductor

* Thermal conductivity: 29.2 W/m·K

* Hardness: 3.5-4.0 on the Mohs scale

Copper sulfide is used in a variety of applications, including:

* As a semiconductor material in electronic devices, such as solar cells and transistors

* As a catalyst in chemical reactions

* As a pigment in paints and ceramics

* As a fungicide and pesticide

* As a component of lubricating greases

* As a source of copper and sulfur in metallurgy

Copper sulfide is a versatile compound with a wide range of properties that make it suitable for a variety of applications.