Flash rocks - aka quartz - are one of the few minerals with piezoelectric proprieties. Rub these stones quickly together and see them start to glow from within (for best results, try it in a dark room!) and emit a warm odor from the friction. It’s the coolest and easiest science experiment you can do right at home!
- made in the USA
- stone sizes vary
- 3.5” x 6” card package