DZI Three Eye Agate 8mm Round Black - 15-16 Inch Stone Type_Mixed 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

black or brown veins running through it in web to like patterns

sodalite and pyrite

It is made up of Calcite or Calcium Carbonate

Tiger Eye is a macrocrystalline Quartz stone with bands of rich golds and browns

DZI Three Eye Agate 8mm Round Black - 15-16 Inch Stone Type_Mixed Viking explorers used thin piecesDZI Agate is made to resemble beads first found in India between 1000 and 2000 BCE. These reproductions are designed in the traditional color, pattern and finish of the original DZI beads. Authentic DZI beads were used in ancient times in India, Tibet and other Asian countries, and those that still exist today have been passed down for generations. The original stones were often used as protective amulets and are usually scarred or pitted in places