Formula: Pb₄FeSb₆S₁₄   May contain minor Bi.

Species:

Colour: Gray-black; iridescent at times

Lustre: Metallic

Hardness: 2½

Specific Gravity: 5.63

Crystal System: Monoclinic

Name: Named in honor of Robert Jameson (1774–1854), naturalist and mineralogist. He was Professor of Natural History at the University of Edinburgh for fifty years.

Type Locality: Cornwall – England, UK

Isostructural with: Benavidesite Benavidesite-Jamesonite Series.
Easily confused with boulangerite with which it may be intergrown. As in boulangerite and, e.g., robinsonite and zinkenite, the structure contains interconnected SbS₃ groups.