Blue Chalcedony (Marbled) 10mm Round 15-16 Inch Slab its oldest known use being

its oldest known use being in Egypt more than five thousand years ago

but is most commonly associated with white

pale green or copper red

It was named from the Latin "Thule" - which was a term used by ancient Greeks and Romans to refer to the then-little-known lands to the north or present day Scandinavia

It has also been considered a sacred stone in India throughout its history

Blue Chalcedony (Marbled) 10mm Round 15-16 Inch Slab its oldest known use beingBlue Chalcedony is a naturally occurring soft blue translucent stone. It is a member of the Quartz family, a form of silica with a cryptocrystalline structure that incorporates Moganite along with the Quartz. Known in antiquity as the Speakers Stone, it is believed to have been worn Cicero, the great Roman orator. These strands were cut into beads with some of the material the Chalcedony was mined out of remaining, creating a unique "marbled" look.