Geocronite

Geocronite is a mineral, a mixed sulfosalt containing lead with a formula of Pb14(Sb, As)6S23. Geocronite is the antimony-rich endmember of a solid solution series. The arsenic-rich endmember is named jordanite. It occurs as grey, black, to silvery white monoclinic veins usually associated with other similar minerals, particularly the sulfides of iron and copper.

The mineral has been found in Spain and Sweden where it was first identified in 1839.