Valleyite
Valleyite is an IMA-recognized mineral species in the oxides & hydroxide class, with the chemical formula Ca₄Fe₆O₁₃.
It crystallizes in the cubic crystal system (space group I-43m). It is a member of the Cancrinite-sodalite, Sodalite structural group.
IMA symbol Vly, IMA status: approved, named in 2017.
An oxidation product of basaltic glass, on the surface of vesicles, developed during the early stage of the scoria formation (Idaho) and in paralava, fused sedimentary rock (Wyoming).
It is found associated with Hematite, maghemite, luogufengite, quartz (Idaho); esseneite (Wyoming).
The mineral was named to honor John W. Valley (b. 1948) of the University of Wisconsin-Madison. Valley was the President of the Mineralogical Society of America during 2005-2006.