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Pronunciation varies by accent · noun
(mineralogy) A zinc-containing variety of pyroxene of olive-green color passing into brown..
Use jeffersonite when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Jeffersonite means (mineralogy) A zinc-containing variety of pyroxene of olive-green color passing into brown..
The closest synonym depends on the sentence and intended sense.
The opposite depends on the specific sense.
Use jeffersonite where its definition matches the intended context.
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