Weird stone block in Minecraft? - 1

I was tunneling through a mountain when I came upon a few weird stone blocks. They look the same as normal smooth stone, but they're harder to break, and there's this… Prism-like, or rainbow-like burst as they break. Anyone know what's up with this?

Selias

Is it true? Legend says that these stones, when broken, will give the user ultimate power, and he will become ruler of the world!

NAH, joking. They are most likely from a mod.

Guest