oil in quartz
As the name suggests, oil-in-quartz is a gemstone with oil inside the quartz.
The color of the oil is often neon yellow, but there are also colorless ones.
This oil is actually petroleum, and when exposed to a black light, it fluoresces neon blue.
Some of them have moving bubbles.
Karatz GemMagazine
" Oil in Quartz "
Karatz GemMagazine
" Oil in Quartz "