Traskite (brown) and Kampfite (bluish), from Big Creek, Fresno County, California, United States of America — Photo: David Hospital - www.purple-sky-minerals.com · CC BY-SA 3.0
Kampfite
A rare barium silicate-carbonate-chloride discovered in 1964, named for mineralogist Anthony Kampf.
Intro adapted from Wikipedia (CC BY-SA).
Kampfite is an IMA-recognized mineral species in the silicate class, with the chemical formula Ba₁₂(Si₁₁Al₅)O₃₁(CO₃)₈Cl₅.
It crystallizes in the monoclinic crystal system (space group Cc).
Key properties: Mohs hardness 3; specific gravity 3.809; White streak; Vitreous luster; refractive index 1.618; optically biaxial.
IMA symbol Kpf, IMA status: approved, named in 2000.
Found in quartz-sanbornite bodies in contact metamorphic gneiss near a granodiorite pluton.
It is found associated with Celsian, fresnoite, macdonaldite, titantaramellite, traskite, witherite, pyrrhotite.
The mineral was named to honor mineralogist Anthony Robert Kampf (b. 1948), Curator and Section Head of Minerals, Los Angeles County Museum of Natural History, California, USA.