My son found this stone on the beach on the island Crete. It was a one of its kind, no other visible stone on the beach was the same.
We asked the locals, but they did not know this stone.
It's about 15 cm long and weighs 1,3 kg.
It's not very hard or soft. I think it is a litle harder than marble: I can scratch it with a knife, but just barely, a coin can not scratch it.
Is it marble?
Where does it originate from?