Erythrite is a mineral composed of cobalt, arsenic, and hydroxide, with the chemical formula Co3(AsO4)2·8H2O. It typically appears as pink to red crystals and is often found in oxidized cobalt deposits. Erythrite is known for its vibrant color and is sometimes referred to as "cobalt bloom." This mineral is primarily used as an indicator of cobalt deposits and can be found in various locations worldwide, including Morocco and Germany. Erythrite is not commonly used in industrial applications but is of interest to mineral collectors and geologists studying cobalt mineralization.