Geographic Minerals



Heptasartorite is a very rare mineral with formula Tl7Pb22As55S108. 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 Langenbach, Switzerland, which is famous for thallium minerals.

General Information

  • Category: Sulfosalt
  • Formula: Tl7Pb22As55S108
  • Crystal system: Monoclinic
  • Crystal class: Prismatic (2/m) (same H-M symbol)


  • Luster: Metallic
  • Colour: Grey
  • Hardness: 3 – 3½ on the Mohs scale
  • Member of: Sartorite Group

Heptasartorite comes from Lengenbach quarry in Switzerland, which is famous for thallium sulfosalts. Chemically similar minerals include edenharterite and hutchinsonite.


Information Source: