This file contains the CGI Particle type vocabulary, as defined by the IUGS Commission for Geoscience Information (CGI) Geoscience Terminology Working Group. Used to specify particleType in particleTypeDescription associated with a compoundMaterial. Terms to specify the nature of individual particles of each constituent in an aggregation, based mostly on their genesis. Because the constituents are identifiable parts, the part units must have some definition. Examples include clasts, crystals, pore space, material fossil. Constituent type is determined based on the nature of the particles, and ideally is independent of the relationship between particles in a compound material aggregation. By extension, this vocabulary includes all concepts in this conceptScheme, as well as concepts in any previous versions of the scheme.