iolite sunstone
Iolite sunstone refers to iolite that sparkles when exposed to light.
This sparkle is due to an optical effect called "aventuressence", and is thought to be caused by the inclusion of iron minerals such as lepidocrocite (lepidocrocite).
It is also sometimes called "Aventurine Iolite".
Karatz GemMagazine
" Iolite "