Britannica Sources used in this answer

Which mineral is the most common arsenic-bearing mineral?

Created from Britannica articles using AI. AI can make mistakes, so verify using Britannica articles.

A labeled diagram of the periodic table entry for arsenic, showing its atomic number 33, symbol As, atomic weight 74.921595, electron configuration, and classification as an other nonmetal. Additional icons indicate arsenic is solid at room temperature, has a rhombohedral crystal structure, and weakly acidic oxides. — arsenic Properties of arsenic.

The most common arsenic-bearing mineral is arsenopyrite, also known as mispickel. It is an iron sulfoarsenide mineral with the chemical formula FeAsS and serves as the primary ore of arsenic.12