First of all, I know its a banned topic, but rule 13 says, you must first visit the minecraft wiki, and there was no information about this. so im posting it.

So. I was flying in spectator through the world (with X-Ray) to search for big Ore veins and unusual stuctures, when I found a pretty big Diamond vein. Nothing real unusual, but I decided to inspect it in creative. And appareantly, one of the Ore blocks was compleatly covered in Bedrock. Does anybody know more about it, and how this generation happens?