Which mineral is often used as a pigment in paints and is composed of copper?

Malachite is a mineral composed primarily of copper carbonate hydroxide and is known for its rich green color, which makes it an excellent pigment for use in paints. The unique properties of malachite, including its vibrant hue and ability to create a range of shades when processed, have made it a historical choice for artists and manufacturers seeking natural pigment sources. This mineral can be ground into a powder to produce a green paint, a practice that dates back to ancient civilizations. In contrast, chalk is primarily calcium carbonate, quartz is a crystalline form of silica, and talc is composed mainly of magnesium silicate; none of these have the characteristic color or copper content that makes malachite a suitable pigment.