| Definitions | | tridymite |
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noun (plural: tridymites)
- (mineralogy) A rare mineral of volcanic rocks that solidified at a high temperature. 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.
- Chemical composition: Silicon dioxide, <math>SiO?_2</math>
Etymology: The name refers to the peculiar habit of crystallizing in groups of three individuals.
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