Prehnite with Rutilate 8mm Round - 15-16 Inch 12 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

polished to show off all it's amazing colors

second only to Quartz

3-4 small ranging 15-20mm

and features dark manganese dendrites throughout

Prehnite with Rutilate 8mm Round - 15-16 Inch 12 Viking explorers used thin piecesPrehnite was the first mineral to be named after a person: its discoverer, Dutch Colonel Hendrik Von Prehn. Von Prehn discovered the stone in South Africa in 1774. Prehnite is translucent to transparent, in colors from light green to yellow green to olive, with occasional inclusions of Black Tourmaline that crisscross the stone in fibrous patterns. It is a phyllosilicate composed of silicon, calcium and aluminum with trace amounts of iron.