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: T Tæ Tê T- T. Ta Tb Tc Td Te Th Ti Tj Tk Tl Tm Tn To Tp Tr Ts Tt Tu Tv Tw Tx Ty Tz

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WORDNET DICTIONARY
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OXFORD DICTIONARY

tridymite

Noun

trid=y=mite

WORDNET DICTIONARY

tridymite, n. [Gr. threefold. So called in allusion to the supposed threefold nature of the twin crystals.].

Pure silica, like quartz, but crystallizing in hexagonal tables. It is found in trachyte and similar rocks. [1913 Webster]

tridymite, n. a crystallized form of silica, occurring in cavities of volcanic rocks.

Etymology

G Tridymit f. Gk tridumos threefold (as TRI-, didumos twin), from its occurrence in groups of three crystals

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