Heptasartorite is a very rare mineral with formula Tl<sub>7</sub>Pb<sub>22</sub>As<sub>55</sub>S<sub>108</sub>. It belongs to sartorite homologous series. It is related to other recently approved minerals of the series: enneasartorite and hendekasartorite. All three minerals come from a quarry in Lengenbach, Switzerland, which is famous of thallium minerals. Chemically similar minerals include edenharterite and hutchinsonite.