Blue Black Porcelain Agate 10mm Round - 15-16 inch With Matrix 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

The name "biotite" is used because these minerals generally cannot be distinguished without optical

Trace amounts of iron can also affect the hue

Metaphysically it is often used for stress relief and relaxation

known for producing turquoise with strong color contrast and dramatic natural patterning

Blue Black Porcelain Agate 10mm Round - 15-16 inch With Matrix Viking explorers used thin piecesPorcelain Agate is a natural agate that is dyed and heated to give it the unique blue black color and pattern that resembles porcelain.