Kalina
Just lurking...
I have changed it when I added earth mana to gate to underdark (perfect feature for Khazad start btw). Now it provides jewels, but Mount Kalshekk provides earth mana. So for diversity sake (and nice green glow), Standing Stones got nature mana. If it does not fit pedia entry, I should probably change the description to something more druidic.
I thought so

BTW, how about this (parts are taken from other civilopedia entries):
Standing Stones: The Druids form a loose brotherhood of near-hermits who meet once a year to compete, share knowledge and bond at places of great importance to Nature such as nature nodes, sacred trees and groves. The most famous of those gathering places, Standing Stones, is said to be powerful nature node but it's secrets are still to be discovered by mages and druids of Age of Rebirth.
I also noticed that Gate to the Underdark and Tower of Eyes are also lacking descriptions, so I wrote those two (they are very short, but most of Unique Features have short entries):
Gate to the Underdark: Not all dwarves left Underhome to live beneath the stars. Most of them still live in their safe under-hill communities. Not willing to meet humans, who they still consider to be tricksters, they only trade with few selected individiuals and other dwarves. Because of this, gems they mine are in high demand at markets of Kwythellar.
Tower of Eyes: Tower of Eyes, the Palus, used to be a prison for one of the most powerful mages of Patria. Perpentach, master of mind magic, was locked in this dungeon deep in wastelands by Kylorin and while he finally managed to escape, he left many of his secrets behind.