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Pronunciation varies by accent · noun
(mineralogy) A rare mineral of volcanic rocks that solidified at a high temperature, with the chemical composition silicon dioxide, SiO₂. Tridymite is chemically identical to quartz, but has a different crystal structure. Sometimes contains sodium aluminum silicate, which seems to be expelled when quartz solidifies at lower temperatures..
Use tridymite when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Tridymite means (mineralogy) A rare mineral of volcanic rocks that solidified at a high temperature, with the chemical composition silicon dioxide, SiO₂. Tridymite is chemically identical to quartz, but has a different crystal structure. Sometimes contains sodium aluminum silicate, which seems to be expelled when quartz solidifies at lower temperatures..
The closest synonym depends on the sentence and intended sense.
The opposite depends on the specific sense.
Use tridymite where its definition matches the intended context.
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