Marthozite is an orthorhombic mineral It was named after Belgian mineralogist Aimé Marthoz (1894-1962), former Director-general of the Union Minière du Haut Katanga - UMHK
It is usually found in cavities in selenian (selenium -containing) digenite It is specifically found in the zones of oxidation of the Musonoi deposit in Katanga
Marthozite is orthorhombic , meaning that it has three axes of unequal lengths all orthogonal to each other. Since it is orthorhombic, marthozite is biaxial, meaning that it has three different indices of refraction Marthozite is anisotropic , which means that it breaks light into one fast ray and one slow ray. Marthozite shows pleochroism from yellowish brown to greenish yellow.