FormulaCoAs2−3
OriginBou Azzer (Morocco) 
DescriptionSolid piece of skutterudite with discernible crystal faces on the upper side. 
Classification (Lapis) Sulfides
Crystal SystemCubic
Hardness5,5 – 6,0
ColourTin-white to silver-gray, tarnishes gray or iridescent; in polished section, gray, creamy or golden white
StreakBlack
Luminescence 
LustreMetallic
Transparency (Opacity)Opaque
CleavageDistinct
FractureConchoidal to uneven
Magnetism 
Geological SettingTypically in medium- to high-temperature hydrothermal veins with other Ni–Co sulfide minerals
Specific Gravity6,5 g/cm3
Kristallmodell







#© Mark Holtkamp