Iolite with Flash 6mm Round - 15-16 Inch R0712 Pietersite is composed of Tiger

Pietersite is composed of Tiger Eye

and it can be mottled or striated with veins of these colors

Blood Quartz is a clear to milky to white silicon dioxide mineral

It is mined under extremely harsh conditions and the high-grade specimens are more rare than diamonds

Russia and Brazil

Iolite with Flash 6mm Round - 15-16 Inch R0712 Pietersite is composed of TigerIolite most commonly occurs in shades of blue to gray, violet or indigo. It displays a visual property called pleochroism, which means that it can appear to be different colors as it shifts in the light. According to Norse legend, Viking explorers used thin pieces of Iolite as the worlds first polarizing lens to help them determine the exact location of the sun for navigation.