Tags: Chemical Substance, Mineral.
Polybasite is a sulfosalt mineral of silver copper antimony and arsenic. Its chemical formula is [(AgCu)6(SbAs)2S7][Ag9CuS4].It forms black monoclinic crystals (thin tabular with six corners) which can show dark red internal reflections. It has a Mohs hardness of 2.5 to 3. It is found worldwide and is an ore of silver. The name comes from the number of base metals in the mineral.
