From "A Handbook of Indian Artifacts from Southern New England", Mass. Arch. Soc., 1991, pg. 77
"Magic Stones: Late Archaic to Late Woodland.
Material preferences: quartz, unusual stones
Description: These items are altogether unmodified, most often quartz crystals but also gastroliths or other oddly shaped or colored stones that might be encountered on rare occasions. They are not infrequently found associated with cremation burials, but also occur at habitation sites, where they may have been part of shamans' medicine kits."
Gastroliths are dinosaur gizzard stones, swallowed to aid in digestion. Usually colorful,and polished from being a gizzard stone. Other examples include quartz crystals, quartz crystal clusters, other mineral crystals, concretions, fossils.
i have found fossil specimens on habitation sites that were almost surely transported there.
Also, manuports is a term used to describe items transported to sites as raw materials, but which were not themselves altered for use as tools. Chunks of graphite or hematite, paintstones, fit here. They may show scratches from extracting the raw pigment, but were not used as tools. Still artifacts of a sort. Artifactual. Chunks of iron pyrite used in fire making kits also fit here.