Lautite is a rare mineral belonging to the class of sulfides with the general formula CuAsS. It is orthorhombic and is known to form up to 2.3 cm long prismatic or flat crystals. It is also found as grains or masses.
First identified by Friedrich August Frenzel in 1880 in the Rudolphschacht mine near Lauta in Saxony, it was named after its type locality
Lautite is formed in veins under hydrothermal conditions at medium temperatures. Depending on the locality it is found accompanied by arsenic , chalcopyrite (in the type locality); by kutinaite (in Nieder-Beerbach , tennantite, loellingite , proustite, and quartz (in Sainte-Marie-aux-Mines ).
Aside from the type locality, the mineral is found in other places in the Ore Mountains in the Harz , Hausach, and Titisee-Neustadt, Flatschach in Switzerland, Luqu in India in Namibia in Arizona, US.