African Petrified Wood Agate 6-7mm Table Cut Cube Bead - 15-16 Inch R1755 red and white -- as

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

its variations seem to depict landscapes and other images

currently believed to be due to the presence of a copper-based mineral such as Malachite or Azurite

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

pattern and finish of the original DZI beads

African Petrified Wood Agate 6-7mm Table Cut Cube Bead - 15-16 Inch R1755 red and white -- asPetrified 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.