Ardaite is a very rare sulfosalt mineral with chemical formula Pb19Sb13S35Cl7 in the monoclinic crystal system,[2][3] named after the Arda River, which passes through the type locality.

[8] Greenish gray or bluish green in color, its luster is metallic.

Ardaite occurs as 50 μm fine-grained aggregates of acicular crystals associated with galena, pyrostilpnite, anglesite, nadorite, and chlorine-bearing robinsonite and semseyite, in the Madjarovo polymetallic ore deposit in Bulgaria.

[2] The type locality is the Madjarovo polymetallic ore deposit in the Rhodope Mountains.

[9][10] Later its occurrence was proved in the Gruvåsen deposit, near Filipstad, Bergslagen, Sweden.