Nuclear Decay meets autunite

So I did a little followup research and found this site:

and… well, today I got a package in the mail:

Inside was a little rock:

and a small UV light that makes the rock do this:

And if I put the little rock close to the Nuclear Decay module’s Geiger tube, it does this:

(The envelope output is going to a VCA, with a VCO on the signal input; there’s a low frequency ramp controlling the VCO pitch.)

And yes, this stuff is safe, if you handle and store it correctly.