Iolite with Flash 6mm Round - 15-16 Inch R0712 and it can be mottled

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

Russia and Brazil

Pietersite is composed of Tiger Eye

It is transparent or translucent

orange and yellow colors in which it occurs

Iolite with Flash 6mm Round - 15-16 Inch R0712 and it can be mottledIolite 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.