noun
Meaning 1
A fine-grained mineral, of SiO2, that is a polymorphic form of quartz formed under very high pressure.
Definition source: English Wiktionary via Wiktextract
Usage: uncountable, usually
Topics: chemistry, geography, geology, mineralogy, natural-sciences, physical-sciences
No example sentence was provided for this meaning.
Meaning relationships
Synonyms: none provided
Antonyms: none provided