If you’re like me and pick up interesting rocks all the time and then like to use them in your terrarium, be careful! After my four asbolus verrucosus inexplicably died, each about 4 weeks after I got them and there was no other possible reason for the deaths, I was ready to consider the rocks as the culprits. And I found they were radioactive! Carnotite in rocks creates the yellow to orange and it is radioactive. Pretty but NO!
