Volume 46 of Reviews in Mineralogy and Geochemistry covers the international meeting on "Advances on Micas (Problems, Methods, Applications in Geodynamics)" convened in Rome in 2000. The topics of this meeting were the crystalchemical, petrological, and historical aspects of the micas. Thirteen invited plenary lectures, which consisted mostly of reviews, are presented in expanded detail in this volume. Contents: Mica crystal chemistry and the influence of pressure, temperature, and solid solution on atomistic models Behavior of micas at high pressure and high temperature Structural features of micas Crystallographic basis of polytypism and twinning in micas Investigation of micas using advanced transmission electron microscopy Optical and Mössbauer spectroscopy of iron in micas Infrared spectroscopy of micas X-ray absorption spectroscopy of the micas Constraints on studies of metamorphic K-Na white micas Modal spaces for pelitic schists Phyllosilicates in very low-grade metamorphism: Transformation to micas Historical perspective