While materialType captures the broad material class like LITHIC or CERAMIC, the objectType field describes the specific kind of object — for example a "biface", a "nail", or a "bead". It is free text rather than a fixed list, so you can record whatever terminology your project uses. The field is optional, useful for finds you can classify and safe to leave blank for unidentified fragments. Together with materialType and description, it makes the catalog searchable by object class.
Technical section
Data model, API, and internals — visible to developers.