Paulkellerite Field of view: 35 mm Locality: Schneeberg, Erzgebirgskreis, Saxony, Germany Description: Type mineral specimen (holotype) of yellow-green paulkellerite from Schneeberg, Saxony, Germany. Specimen number 163777-00, photo provided by the U.S. National Museum of Natural History at the Smithsonian Institute. Taken by Ken Larsen. — Photo: Kelly Nash · CC BY 3.0
Paulkellerite
Paulkellerite is an IMA-recognized mineral species in the phosphate class, with the chemical formula Bi³⁺₂Fe³⁺O₂(PO₄)(OH)₂.
It crystallizes in the monoclinic crystal system (space group C2/c).
Key properties: Mohs hardness 4; specific gravity 4.2; Very pale yellow streak; Vitreous to adamantine luster; optically biaxial.
IMA symbol Pkl, IMA status: approved, named in 1987.
Found as a rare secondary mineral in Bi–Ni–Co ores in a hydrothermal ore deposit.
It is found associated with Bismuth, skutterudite, pyrite, erythrite, bismutoferrite.
The mineral was named to honor Dr. Paul Keller (1940–), Professor of Mineralogy, University of Stuttgart, Stuttgart, Germany.