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noun
A massive mineral, greenish in colour and opal-like in appearance, essentially a hydrous silicate of iron.
Definition source: English Wiktionary via Wiktextract
Topics: chemistry, geography, geology, mineralogy, natural-sciences, physical-sciences
No example sentence was provided for this meaning.
Synonyms: none provided
Antonyms: none provided
History
From chloro- + opal.
