



Found on a beach in the UK!
Found this ‘rock’ recently on a beach in the UK. It is black all over, has very straight edges and is black on the inside. When scraped against other rocks it leaves a black mark but it’s too heavy and solid to be charcoal. This piece weighs 67grams. It’s not a roof slate/tile as there are lots of those on beaches around here and they are usually much thinner. Any ideas?