The crystal skulls are a particularly notable example of the popularization of pseudoarcheological ideas. Some belive the skulls to be

Origin

Pseudoarchaeological Impact

Tied to Atlantis and also aliens

supernatural powers

pop culture and Indiana Jones

Electron Microscope analysis reveal modern tool marks

probs mid to late 1800s

crystal from Brazil or Madagascar and manufactured in Germany

no similar artifacts on real archaeological excavations

Walsh, Jane MacLaren. "legend of the Crystal Skulls." Archaeology 61.3 (2008): 36-41.