Aktashite is a rare arsenic sulfosalt mineral with formula Cu6Hg3As4S12.

It is a copper mercury-bearing sulfosalt and is the only sulfosalt mineral with essential Cu and Hg yet known.

It is of hydrothermal origin.

It was published without approval of the IMA-CNMNC, but recognized as valid species by the IMA-CNMNC Sulfosalts Subcommittee (2008).

This article about a specific sulfide mineral is a stub.