[Jweb_Guru]

Mostly true on Earth, but not on other planets with lower gravity, and AFAIK it depends on the rock type. Hence why you have Olympus Mons on Mars (or insanely tall ice mountains on Pluto, when that material couldn't form such a steep talus angle on Earth).

[ghaff]

Well, yes, I'm talking about ~1g on earth. And, also yes, rock type makes a difference but I assume there is some commonality with the tallest peaks.