They may be interested in this source of fluorescent "minerals".

Kvanefjeld is already known among mineral collectors as a source of fluorescent minerals such as tugtupite and chkalovite.

Langesundsfjorden is especially noted for the discovery of fluorescent minerals.

This locale produced more species of minerals (over 300) and more different fluorescent minerals than any other location.

He spent his time playing with fluorescent minerals.

Inside this outcrop (visitors enter by a little door) is a cave alive with the glow of fluorescent minerals.

But the biggest impression on the school groups who flock here is made by the fluorescent minerals.

These are fluorescent minerals, calcite and willemite, found in the New Jersey highlands near Franklin.

Fluorescence can be an indication of crude oil staining, or of the presence of fluorescent minerals.

Database of fluorescent minerals with pictures, activators and spectra (fluomin.org)