Matches in DBpedia 2016-04 for { ?s ?p "The crystal skulls are a number of human skull hardstone carvings made of clear or milky quartz rock, known in art history as \"rock crystal\". They are often claimed to be pre-Columbian Mesoamerican artifacts by their alleged finders, however, none of the specimens made available for scientific study have been authenticated as pre-Columbian in origin."@en }
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- Crystal_skulls_in_popular_culture comment "The crystal skulls are a number of human skull hardstone carvings made of clear or milky quartz rock, known in art history as \"rock crystal\". They are often claimed to be pre-Columbian Mesoamerican artifacts by their alleged finders, however, none of the specimens made available for scientific study have been authenticated as pre-Columbian in origin.".