Crossword clue: a bituminous substance obtained from the mercury mines of idria, where it occurs mixed with cinnabar.

The most common answer is idrialine (9 letters).

2 answers found in Letterora's clue database (Wikidata facts, Open Trivia DB, WordNet and Webster definitions — all licensed sources).

Possible answers

idrialine 9 letters web-def

A bituminous substance obtained from the mercury mines of Idria, where it occurs mixed with cinnabar.

idrialite 9 letters web-def

A bituminous substance obtained from the mercury mines of Idria, where it occurs mixed with cinnabar.