Volume 21 of Reviews in Mineralogy treats a short course on the rare earth elements to about 80 participants in San Francisco, California, December 1-3, 1989, just prior to the fall meeting of the American Geophysical Union.

Contents:
Cosmochemistry of the Rare Earth Elements: Condensation and Evaporation Processes
Radiogenic Isotope Geochemistry of Rare Earth Elements
Partitioning of Rare Earth Elements between Major Silicate Minerals and Basaltic Melts
An Approach to Trace Element Modeling Using a Simple Igneous System as an Example
Rare Earth Elements in Upper Mantle Rocks
Rare Earth Elements in Metamorphic Rocks
Rare Earth Elements in Sedimentary Rocks: Influence of Provenance and Sedimentary Processes
Aqueous Geochemistry of Rare Earth Elements
Rare Earth Elements in Lunar Materials
Compositional and Phase Relations among Rare Earth Element Minerals
Economic Geology of Rare Earth Minerals
Cathodoluminescence Emission Spectra of Rare Earth Element Activators in Minerals