Chapter 108 Crystal structures of rare earth minerals

摘要: Publisher Summary The rare earth minerals are defined as containing elements essential constituents. However, to judge this criterion, it is necessary obtain structural well compositional information about the mineral. In addition, determination of a chemical formula for mineral also requires in many cases, because order or disorder certain atoms crystal structure cannot be determined by analysis alone. Therefore, with significant contents earths treated chapter, even if content appears “unessential” always contain variety elements. Crystal structures have been reported half known minerals. analyses revealed that them solid solutions ions and other heterovalent ionic radii comparable those ions; some independent crystallographic sites atoms.