Franckeite, chemical formula Pb5Sn3Sb2S14, belongs to a family of complex sulfide minerals.

It is named after the mining engineers, Carl and Ernest Francke.

[3] It can be found in Bolivia at Poopó in Oruro and at Las Aminas, southeast of Chocaya, in Potosi.

Franckeite has an average density of 5.7 and can be both grayish black, blackish gray in color.

It occurs with cylindrite, teallite, plagionite, zinkenite, cassiterite, wurtzite, pyrrhotite, marcasite, arsenopyrite, galena, pyrite, sphalerite, siderite and stannite.