There's another in Northeastern Thanalan which I've been told is the Thautamurge deity. Not sure if that's true, and unfortunately am too lazy to look up coords. It's there, though, in one of the "mole holes" East of the Golden Bazaar. Look for it on the way to hand in your Santa Hat.
That's a small temple to Thal, one of the twin gods of Ul'dah, and the location's name is Thal's Respite. Down in Southern Thanalan is another location for Nald named Nald's Reflection with a small lake. I haven't been able to get down there yet to check it out for any temples or statues, but it's a possibility.
The stone in the OP is apparently called Amberscale Rock according to the maps. It looks very similar to aethyrite, especially the large stones in Mor Dhona, so I'm curious if they're related.
There are so many little touches like this in the game that don't have full explanations or reasons yet, and it's fun to find them!