Where is the crystal room?

I remember a few times seeing screenshots of a cool little place that I can only describe as a "Crystal Room."

Does anyone know what I'm thinking of and where it's located?

The crystals where like the ones in the Mor'Dhona rocks

According to this PHOTO from within this THREAD, it appears to be in the southwest corner of Mor Dhona. Is that the place you're thinking of?

You, my friend, ROCK.

Exactly what I was looking for!