Eifel

It was the first mineral of its group found with sodium in the octahedral site that magnesium or iron normally holds.

K. Abraham and co-workers announced eifelite in 1980 under a title noting sodium in octahedral position, and published the full description in 1983, from the volcanic Eifel district of Rhineland-Palatinate. The Eifel's alkaline lavas and their limestone xenoliths are among the most productive type localities in Europe. Type material is held in Bochum and at the Smithsonian.