Algodonite is a copper arsenide mineral with formula: Cu6As. It is a gray-white metallic, copper arsenide mineral, crystallizing in a hexagonal pattern. The mineral was first discovered from the Algodones silver mine in Coquimbo, Chile in 1857. It is a gray-white metallic mineral crystallizing in the hexagonal system. It has a Mohs hardness of 4 and a specific gravity of 8.38 – 8.72. It is not Radioactive.

It was first described in 1857 from the Algodones silver mine, Coquimbo, Chile.

General Information:

  • Category: Sulfide mineral
  • Formula: Cu6As
  • Crystal system: Hexagonal
  • Density:8.38 g/cm3 (Measured) and 8.72 g/cm3 (Calculated).


Algodonite can be identified in silver-white or steel-gray color forms. This mineral is opaque and non-fluorescent in nature. It has metallic lustre and nonmagnetic properties. Sub-conchoidal fractures are developed in brittle materials, having semi-curving surfaces. It forms massive granular crystals, commonly observed in granite or other igneous rock.

  • Formula mass: 456.2 g/mol
  • Color: Gray, silver-white, steel gray, tarnishes dull bronze
  • Crystal habit: Massive, granular. Common texture observed in granite and other igneous rock
  • Fracture: Sub-conchoidal
  • Mohs scale hardness: 4
  • Luster: Metallic
  • Diaphaneity: Opaque
  • Specific gravity: 8.38 (measured), 8.72 (calculated)

Global Distribution

Algodonite is distributed in the following places: Chile, Bolivia, Argentina, USA, Sweden, France, Namibia, Iran etc.


Algodonite is uncommon in hydrothermal deposits and is closely associated with other copper arsenides, koutekite, domeykite, and silver.


Information Source: