This surprisingly light weight material is estimated to be around two billion years old. To put that into context, some stones at Stonehenge are made up of rock containing sediments from around the same time. Some of the oldest rocks on Earth are more than four billion years old, meteorites can be much older.
Particles from one of the most studied meteorites that fell in Australia in 1969 are estimated to be seven billion years old. The age of Earth is a mere 4.54 billion years old.
These shungite tumbled stones have an incredibly smooth texture. The deep charcoal grey to black colour is from carbon.