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(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.
Related-word data is supplemented by the Datamuse API. Datamuse results are suggestions, not automatic replacements.