Hunt for origins of beautiful Tsodilo ritual stones begins

The rare finds that startled researchers include chalcedony, silcrete and an as yet to be identified shiny, white, silcretised organic material.  Researchers are convinced that Tsodilo, whose rocks or stones are mainly quartz, cannot be the source of the semi-precious stones found at a cave they excavated.

 However, they say the silcrete is available within 40-150km from Tsodilo.  That is the area they will be traversing to compare materials using the technology called finger-printing.