These living stones known as Trovants came into existence due an earthquake 6 million years ago.
They are now found in a small Romanian village named Costesti. However similar ‘rocks’ can also be found in Russia, Kazakhstan, Czech Republic, and other places.
There are many explanation in formation of these Trovants. But as the simplest explanation is these rocks have a core filled with minerals packed concretely. Then it is coated with highly porus sand. Then the outer cortex is cemented by calcium carbonate. When there is heavy rainfall; water is absorbed by the stone. Some type of chemical reaction occurs exerting pressure on the core and notches or bulges are formed outward on the cortex. Thus the stone grows in size.
This type of bulging can be of different sizes and shape. Such as cylindrical, circular, spherical or nodular. The size can vary from few millimeter to 10 meters.
Every time it rains the Trovants grow.
When you cut the stone you can find aging rings on it just as living beings. They also have root network like plants. The name Trovants was first given by Romanian naturalist Gh. M. Murgoci in his work “The Tertiary in Oltenia”.
In 2004, The “Muzeul Trovantilor” or “Trovants Museum Natural Reserve “ was commissioned to protect the unusual geological creations.
Interestingly you can take a Trovants stone and plant it in your garden and wait for rainy season for it to grow.
Not only it has ability to grow. It can also move. Weird Magnatic field, Alien intervention or strange energy vortexes in the region are some theories behind its movement.