A Glowstone is a Treasure of the Kithain.
Overview
This simple quartz rock glows brightly upon hearing the secret command word. The beam it casts looks very similar to that of a flashlight, if the back of the stone is clenched tightly. Otherwise, it simply casts radiance in all directions; enough to light a small room. Though a Glowstone looks like an ordinary rock, someone examining it closely will see what appears to be a firefly trapped inside. Nockers especially treasure Glowstones, often imbedding them in the devices they create.
References
- CTD. Changeling: The Dreaming (1st Edition), p. 217.