Formula: (Cu_1-xAs_x) (x ≈ 0.15)

Species:

Colour: Steel-gray to silver-white, tarnishes dull on exposure

Lustre: Metallic

Hardness: 4

Specific Gravity: 8.38

Crystal System: Hexagonal

Name: Named after its discovery locality in Chile.

Type Locality: Los Algodones Mine, Los Algodones district, El Arrayan, Vicuña, Elqui Province, Coquimbo – Chile