Yes it's just a straight mia material with a mossy rock texture from cg textures. A slight bump too. To be honest the rock I showed previously is the new version because I had grand ideas of using high detail displacement on them from zbrush, but realised the detail would never be seen, so decided to remodel them simpler with sharper angles and no displacement. Got to keep the memory free for the foliage! I may keep the old versions for another scene someday.
Cheers