If you use alpha terrain defaults, such as k-hippie's (shown), you may have noticed that the giant crystal formations no longer fit in with the rest of the Realm.
These are texture replacements for both the rocks and the glow around them!
I was not able to isolate the invisible lights placed next to them, but I think the new textures still work. ;) You will need a world editing mod to change the lights.
COMPATIBILITY NOTE:
There are JUST the textures, so if you happen to have an unlocker for either of these items, they will work unless the creator of the unlocker included the original textures in their package(s). You can make them compatible by deleting all the images in the unlocker in the warehouse panel of Sims 4 Studio. BE CAREFUL to make a backup first, in case the item isn't an unlocker, but rather a new object that was made buyable.
Happy simming!