Iolite Faceted 10mm Energy Prism - 15-16 Inch Star Cut Round which may form green stains

which may form green stains or specks on Azurite crystals or aggregates

it lightens because of further weathering and becomes Malachite

It was used in the Egyptian Book of the Dead

” Tourmaline is unusual in that it is both pyroelectric and piezoelectric

Iolite Faceted 10mm Energy Prism - 15-16 Inch Star Cut Round which may form green stainsIolite 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.