Start Your Own Rock Collection And Grow Beautiful Crystals! Learn About And Experiment With 8 Different Types Of Rock. Learn How To Smash The Toughest Rock In The World! Comes With An Instruction Booklet To Guide You Through Your Experiments.
Start Your Own Rock Collection And Grow Beautiful Crystals! Learn About And Experiment With 8 Different Types Of Rock. Learn How To Smash The Toughest Rock In The World! Comes With An Instruction Booklet To Guide You Through Your Experiments.