The most common and most likely answer to this crossword clue is the 9 letter word MALACHITE
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The cryptic/wordplay part
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What does MALACHITE mean?
MALACHITE noun- A bright green mineral, a basic copper carbonate, Cu2CO3(OH)2; one of the principal ores of copper.
- A mild green colour, like that of the mineral.
- Of a colour ranging from olive-taupe to a mild to deeply-rich (at times seemingly translucent) green, like that of the mineral which is present on oxidized copper.