3 large beads of neodymium-, praseodymium- and Erbium glass – NEW!
Diameter ~ 20 – 22mm – weight ~ 4.3 – 5g
Doping conc.: 5 mol% Er2O3, Pr2O3, Nd2O3
Nice glass beads made of optical barium phosphate glass. Doped with praseodmyium- , neodymium and erbium oxide (5 mol% concentration each). Each one hand crafted. Since this kind of glass is produced very rarely and only in charges of several hundred kgs, it is a true opportunity to get it.