'Tridymite' definitions:

Definition of 'tridymite'

(from WordNet)

noun

A mineral form of silica

Definition of 'Tridymite'

From: GCIDE

Tridymite \Trid"y*mite\, n. [Gr. ? threefold. So called in allusion to the supposed threefold nature of the twin crystals.] (Min.) Pure silica, like quartz, but crystallizing in hexagonal tables. It is found in trachyte and similar rocks. [1913 Webster]

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