A detailed description of the size, attitude, mineralogy, chemical composition, and geologic setting of the thorium veins in the northeastern part of the Lemhi Pass district.

30% discount for members of The Mineralogical Society of Britain and Ireland Rare Earth Minerals presents a current overview of this geologically and industrially important group of minerals. It presents a wide variety of formats, crystal structures, petrographic descriptions, analytical data and numerous illustrations from outcrop photos to SEM pictures and crystallographic models.