The listing, Lepidolite Mica Book has ended.
Sheets of mica containing Lithium - called 'Lepidolite' - compressed into a form looking like a 'book'. Lepidolite is a lilac-gray or rose-colored member of the mica group with formula K(Li,Al)3(Al,Si)4O10(F,OH)2.[1][2] It is a secondary source of lithium. It is one of the major sources of the rare alkali metals rubidium and caesium.[5] In 1861 Robert Bunsen and Gustav Kirchhoff extracted 150 kg of lepidolite and yielded a few grams of rubidium salts for analysis, and therefore discovered the new element rubidium.