Jamesonite is one of a sulfide that is few that form fine acicular crystals that appear as hair-like fibres. Jamesonite also types larger crystals which are prismatic are confused with Stibnite. Jamesonite is called feather ore and antimony that is grey. Jamesonite is rarely available as inclusions in Quartz cabochons. This material is available from Minas Gerais, Brazil.

Jamesonite can be obtained from many localities, but just a few have provided material that is rich. From Cornwall, England, around St. Endellion [TL] and St. Kew. In Germany, at Freiberg, Saxony; and near Magdesprung, Selke Valley, and Clausthal, Harz Mountains. From Príbram, Czech Republic. At Aranyidka, Baia Sprie (Felsöbánya), and Herja (Kisbánya), Baia Mare (Nagybánya) district, Romania. From Trepca, Serbia. At Sala, Västmanland, Sweden. From Machacamarca, Poopó, and Huanuni, Oruro, Bolivia. In Mexico, through the Noche Buena mine, near Mazapil; the Santa Rita mine, Nieves; and in relatively crystals that are thick the Noria mine, near Sombrerete, Zacatecas. In the USA, in Idaho, at Slate Creek, Shoshone County From the Dachang district, Guangxi Autonomous Region, Asia.

Chemical Formula: Pb4Fe2+Sb6S14
Lead Iron Antimony Sulfide
Molecular Weight: 2,064.07 gm
Composition: Iron 2.71 % Fe
Antimony 35.39 % Sb
Lead 40.15 % Pb
Sulfur 21.75 % O
  100.00 %      


Crystallography: Monoclinic – Prismatic
Crystal Habit: Crystals elongated || [001], acicular and fibrous, to 10 cm; striated k [001]; rarely in rings and spheres. As feltlike masses; massive, columnar, also radial and plumose.
Twinning: On {100}; lamellae very commonly observed in polished section.


Cleavage: Good on {001}; reported on {010} and {120}
Fracture: n/a
Tenacity: Brittle
Moh’s Hardness: 2.5; VHN = 66–86 (100 g load)
Density: 5.63 (g/cm3)
Luminescence: None
Radioactivity: Not Radioactive


Color: Gray-Black, lead Gray, Steel Gray, dark lead Gray; iridescent at times
Transparency: Opaque
Luster: Metallic
Refractive Index: R1–R2: (400) 38.4–45.1, (420) 38.1–44.9, (440) 37.7–44.8, (460) 37.6–45.0, (480) 37.4–45.1, (500) 37.3–45.0, (520) 37.0–44.7, (540) 36.6–44.3, (560) 36.1–43.8, (580) 35.7–43.2, (600) 35.3–42.6, (620) 34.8–41.9, (640) 34.2–41.0, (660) 33.6–40.1, (680) 33.0–39.2, (700) 32.5–38.5
Pleochroism: Distinct
Anisotrophism: Strong; Color in reflected light: Gray-Black