Rule 205.3g

Artifacts have their own unique set of subtypes; these subtypes are called artifact types. The artifact types are Attraction (see rule 717), Blood, Bobblehead, Book, Clue, Contraption, Equipment (see rule 301.5), Food, Fortification (see rule 301.6), Gold, Incubator, Infinity, Junk, Lander, Map, Mutagen, Powerstone, Spacecraft, Stone, Treasure, Vehicle (see rule 301.7), and Vibranium.