There are 17 Special Interest Commissions (on Clay Minerals; Contemporary Mineral-Bearing Processes; Cosmic Mineralogy; Crystal Chemistry, X-ray Diffraction and Spectroscopy of Minerals; Crystal Genesis; Environmental Mineralogy and Geochemistry; Experimental Mineralogy; Fluid and Melt Inclusions in Minerals; High School Teaching in Mineralogy; History; Mineral Processing; Mineralogy of Gemstone Deposits and Gemology; Museums; New Minerals, Nomenclature and Classification; Ore Mineralogy; Organic Mineralogy and Physical Methods of Investigation of Minerals).