Iolite 4-7mm Faceted Rondelle - 18 Inch Closeout This mineral forms in limestone

This mineral forms in limestone and marble

It is also known as Dragon's Blood Stone or Dragon Stone if it has red coloration

a variety of Jasper containing variably colored spherical patterns

The colors are predominantly a deep red/brown

Iolite 4-7mm Faceted Rondelle - 18 Inch Closeout This mineral forms in limestoneIolite 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.