[BoTW] Unbreakable white rock?

Edit: [SOLVED]

I’m by the bird people, climbing the mountain that the little kid bird pointed out with a big white tree at the top. Near the summit I found what looks like unbreakable white rocks. I googled it and couldn’t find anything. Tried breaking it with several hard hits from an iron hammer and tried blowing it up with bombs, but nothing happened. Does anyone know what these are, if anything?