Iolite with Flash 10mm Round - 15-16 Inch - CLEARANCE Gem Silica Shungite has been used as

Shungite has been used as a folk medical treatment since the early 18th century

and this phenomenon is thought to be due to impurities of yttrium or organic matter within the crystal lattice

Its color is due to the presence of Manganese and Iron in the stone

The different colored zones in the stone result from different oxidation states of iron

or golden-yellow color of the mineral beryl

Iolite with Flash 10mm Round - 15-16 Inch - CLEARANCE Gem Silica Shungite has been used asIolite 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.