Talk:Smoky Quartz/@comment-27475916-20160901193901/@comment-26462356-20160904033520

From Wikipedia: "Bismuth was long considered the element with the highest atomic mass that is stable. However, in 2003 it was discovered to be weakly radioactive: its only primordial isotope, bismuth-209, decays via alpha decay with a half life more than a billion times the estimated age of the universe. Because of its tremendously long half-life, bismuth may still be considered stable for almost all purposes."

So, yes, technically it is radioactive. But no one will ever actually see it cause a Geiger counter to click. The human race will be extinct long before then.