I was on a LAN server and I found that when I mine stone a lot, there is a chance that it will drop iron or coal, instead of dropping cobblestone. It looks like stone, it breaks like stone, but it doesn't drop cobblestone.
Comments 3
I was far away from spawn when this was happening, but some ores i could see and some are stone, like hidden.
It is a glitch with servers, since on your server the ores will take longer to load therefore they look like stone.