Formula: CuAs₂

Species :

Colour: Grey

Lustre: Metallic

Hardness: 3½

Specific Gravity: 5.4

Crystal System: Monoclinic

Name: Named by Zdenĕk Johan in 1961 for the Latin pax, meaning peace.

Type Locality: Černý Důl (Schwarzenthal), Trutnov District, Hradec Králové Region – Czech Republic