Xibaryl
From elanthipedia
There is no real world material bearing the name xibaryl.
Items containing this material may cast the Hypnotize spell.
Alteration Properties
Xybaryl is a pale blue colored stone and has a polished sheen with bands of silvery white running through it.
It is an uncommon material that must be provided for alterations. Intricate detailing via carving is not possible though engraving is fine.