|Hue of light||Weak|
Fluorite Stone 4 is the purple colored Fluorite.
Fluorite stone is a natural resource that can be found underground. Fluorite is mainly found in tunnels and caves where it is light up the dark.
It is light source that doesn't use power and is therefore very usefull when exploring or before having set up electricity production in an area.
Added in the game before update 0.60.