Can somebody give me information on the white rocks with black veins ? Found in Cornwall, England , there were seams of it through the slate rocks on the beach. : r/whatsthisrock

Have I just found someone's painted rock? Black and white triangle

I found some really hard Translucide purplish brown stones .What

Have I just found someone's painted rock? Black and white triangle

Mystery Rock #5 - Georneys - AGU Blogosphere

Cornwall shale hi-res stock photography and images - Alamy

Serpentine rock cornwall hi-res stock photography and images - Alamy

I found some black, light weight, soft rocks near a river. They

Beach Stones with White Lines 22 – Jessica's Nature Blog

Pretty heavy rock, got it in a bowl with a bunch of other rocks

What are these rocks? A 140 foot deep well was drilled on my land