Nagelfluh
This rock is like the class clown of Goldau, everyone uses it. It's what you use to slap together walls like a lazy kid. It came from a rock explosion so big, it made the Rossberg look like it had a bad day.
My neighbor used this stone for his wall, and it looks like it was built by a kid who just wanted to be done.
This stone is so regular, it's like the rock version of a boring teacher.
They threw a mountain at the Rossberg, and it just sighed and fell over.