Granite and marble do emit tiny but noticeable amount of radiation in different proportions.
The radioactivity of marble.
These range from natural materials such as wood marble and granite to engineered products such as quartz stone.
By curiouspost august 23 2015.
Many homes contain decorative rock and stone such as granite and marble.
Some building materials such as granite brick marble and other items contain natural radioactivity.
These marbles barely register on sensitive geiger counters and the radiation emitted barely creeps above the background radiation we experience everyday from natural sources.
Yes it is true.
Both granite and marble are naturally occurring materials that were formed millions of years ago similar to minerals.
Although the marbles emit beta particles and gamma rays which are dangerous at high levels they only give off a small number of these radioactive decay products.
However some articles have circulated that claim granite is a source of harmful radiation specifically radon.