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Pronunciation varies by accent · noun
(uncountable, obsolete, mineralogy, UK) Sphalerite; zincblende..
Use black-jack when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Black-jack means (uncountable, obsolete, mineralogy, UK) Sphalerite; zincblende..
The closest synonym depends on the sentence and intended sense.
The opposite depends on the specific sense.
Use black-jack where its definition matches the intended context.
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