RuneScape Classic Wiki
The main RuneScape Wiki has an article on: Daconia rock
The Old School RuneScape Wiki also has an article on Daconia rock.

Daconia rock is a quest item obtained during the Grand Tree. In the quest, the player discovers the rock after being asked by King Narnode Shareen to search roots in the Grand Tree dungeon. It has magical properties which are harmful to the Grand tree (scenery), and must be returned to the king to prevent the tree from being killed.

Ten inert Daconia rock scenery objects can be found in the southern section of the dungeon. They are simply called Daconia rock. When players attempt to mine or prospect the rocks they get the message "Nothing interesting happens".

E is: Piles of daconia rock

Examine is: Piles of daconia rock