AGU Sections with close connections to MRP:

SEDI Section
Tectonophysics Section
Volcanology, Geochemistry, Petrology

Other Mineral and Rock Physics Sites of Interest:

Physical Properties of Earth Materials (Subgroup within MRP)
COMPRES (Research Group investigating strength of minerals under extreme conditions)
Mineralogical Society of America
Mineral Physics group of the Mineralogical Society of Great Britain and Ireland
Mineral Spectroscopy (Maintained by George Rossman)