The basic structure of [https://web.archive.org/web/20110720035915/http://metpetdb.rpi.edu/ MetPetDB] is based on a geologic sample and derivative subsamples. Geochemical data are linked to subsamples and the minerals within them, while image data can relate to samples or subsamples. MetPetDB is designed to store the distinct spatial/textural context of mineral analysis that is a crucial to petrologic interpretation. A web-based user interface allows a user to become members and download their search results. Approved members may become contributors and upload data to catalogue and share with the public. More information about the data model and the design of the database is available on the MetPetDB Support Wiki.