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Pronunciation varies by accent · noun
(mineralogy) An isometric-hexoctahedral bronze brown mineral containing copper, iron, selenium, silver, and sulfur..
Use geffroyite when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Geffroyite means (mineralogy) An isometric-hexoctahedral bronze brown mineral containing copper, iron, selenium, silver, and sulfur..
The closest synonym depends on the sentence and intended sense.
The opposite depends on the specific sense.
Use geffroyite where its definition matches the intended context.
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