Iolite 4mm Microfaceted Round A Grade - 15-16 Inch Viking’s Compass The name "biotite" is used

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

What is so special about these iron meteorites is their unique Widmanstätten patterns

When the level of iron oxide is high

The presence of Manganese in the stone produces its color

Distinctive for its purple-and-gray tones

Iolite 4mm Microfaceted Round A Grade - 15-16 Inch Viking’s Compass The name "biotite" is usedIolite 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.