Ramdohrite Locality: Chocaya-Animas (Animas-Chocaya), Atocha-Quechisla District, Sud Chichas Province, Potosí Department, Bolivia Dimensions: 1.5 cm x 1.0 cm x 1.0 cm Excellent and very rare. Essentially a monominerallic specimen comprised of bright, metallic-gray, well-formed, striated crystals and subhedral aggregates of ramdohrite to 3mm. Named after the famous ore microscopist Paul Ramdohr. Ex. Rock Currier collection. Tom and Melissa Campbell photos. — Photo: Robert M. Lavinsky · CC BY-SA 3.0
Ramdohrite
Ramdohrite is an IMA-recognized mineral species in the sulfosalt class, with the chemical formula Pb₅.₉Fe₀.₁Mn₀.₁In₀.₁Cd₀.₂Ag₂.₈Sb₁₀.₈S₂₄.
It crystallizes in the monoclinic crystal system (space group P2_1/n). It is a member of the Lillianite structural group.
Key properties: Mohs hardness 2; specific gravity 5.43; Gray-black streak; Metallic luster.
IMA symbol Rdh, grandfathered status — known before the IMA’s founding, named in 1930.
Found in fine-grained quartz in a hydrothermal vein (Chocaya mine, Bolivia).
It is found associated with Pyrite, stannite, andorite, jamesonite, sphalerite, quartz (Chocaya mine, Bolivia); andorite (Bear Basin, Washington, USA).
The mineral was named to honor Professor Paul Ramdohr (1890-1985), German mineralogist.