1) Luminescent mineral 
Idrialite, or idrialine, is a soft, orthorhombic hydrocarbon mineral with chemical formula: C22H14. It is usually greenish yellow to light brown in colour with bluish fluorescence. Raman spectroscopy studies indicate that it may be a mixture of complex hydrocarbons including benzonaphthothiophenes (chemical formula: C16H10S) and dinaphthothiophene...
• (n.) A bituminous substance obtained from the mercury mines of Idria, where it occurs mixed with cinnabar.