I Facet A Stone That I Found In The Desert, But What Is It?

I've come across some interesting stones that have a strong green fluorescence. I cut a piece and talk about what the stones could possibly be.

Faceting Diagram Credit
Design Name: Tessellation 9 (B)
Author: Arya Akhavan
Diagram Link: https://www.gemologyproject.com/wiki/index.php?title=Akhavan_-_Tessellation_9_(B
Note: The facet angles were edited for the stone I faceted in this video, so the finished piece is a little different from the original design.