Are any UV reactive rocks/ minerals safe for axolotls?

[Idnar196]

I have a male GFP that has finally reached adult size, and I would like to add substrate and some new décor to his tank.
The main substrate will be sand, but I would like a few larger rocks as decorations.
He is a classroom pet, and about once a month or so a backlight flashlight is used to see his beautiful glow.
I would love to find some rocks that are safe and glow under black light. Does anyone know of any?

 

[JM29]

Hi,
Look at this site :

Luminescence, fluorescence and phosphorescence of minerals

Database of luminescent (fluorescent) minerals including emission spectra and activators

www.fluomin.org

At least Calcite and Aragonite (different forms of CaCO3) are UV reactive and safe for axolotls.