Mineral separation with heavy liquids is extremely sensitive. It is not only possible to split microcline perthite in to a series of fractions of steadily decreasing perthite content, but also from the more or less perthite-free microcline groundmass. The significance of this in feldspar geothermometry and trace element studies is discussed. In the latter connection, the fractions were examined for variations in Rb and Sr content and revealed unexpected trends.
Separation of perthitic microline by heavy liquid fractionation - a too sensitive method?