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Pronunciation varies by accent · noun
(mineralogy) A trigonal-pyramidal yellowish brown mineral containing calcium, chlorine, hydrogen, iron, manganese, niobium, oxygen, silicon, sodium, and zirconium..
Use o'neillite when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
O'neillite means (mineralogy) A trigonal-pyramidal yellowish brown mineral containing calcium, chlorine, hydrogen, iron, manganese, niobium, oxygen, silicon, sodium, and zirconium..
The closest synonym depends on the sentence and intended sense.
The opposite depends on the specific sense.
Use o'neillite where its definition matches the intended context.
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