African Petrified Wood Agate 6-7mm Table Cut Cube Bead - 15-16 Inch R1755 Viking explorers used thin pieces

Viking explorers used thin pieces of Iolite as the world’s first polarizing lens to help them determine the exact location of the sun for navigation

It was first found in the Unaka Mountains in Tennessee and North Carolina

red and white -- as well as for its opacity and patterns

It forms when Quartz and Feldspar crystallize in radial aggregates within other silica-rich stones

African Petrified Wood Agate 6-7mm Table Cut Cube Bead - 15-16 Inch R1755 Viking explorers used thin piecesPetrified Wood Agate is formed from the petrifaction process of primeval trees over the course of many years. Petrification occurs when the wood is covered by sedimentary rock, as waters loosen and decompose the organic elements and replace them with silicate substances, while maintaining the wood's original structure. Preservation is enabled by a lack of oxygen.