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Pronunciation varies by accent · noun
(mineralogy) A hexagonal-dipyramidal mineral containing hydrogen, iron, magnesium, nickel, oxygen, and tellurium..
Use keystoneite when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Keystoneite means (mineralogy) A hexagonal-dipyramidal mineral containing hydrogen, iron, magnesium, nickel, oxygen, and tellurium..
The closest synonym depends on the sentence and intended sense.
The opposite depends on the specific sense.
Use keystoneite where its definition matches the intended context.
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