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Regular Striations Made by a Grinding Wheel

Credit: Collaborative Research Group (see article)
article: Crystal Skulls' Dating - New Methods Revealed 		Other images from this article
British Museum Crystal Skull Pre Columbian Crystal Goblet Smithsonian Skull Regular Striations Made by a Grinding Wheel Irregular Grooves Made by Hand Cutting
Regular Striations Made by a Grinding Wheel, Collaborative Research Group (see article)