TRIDYMITE

tridymite

(noun) a mineral form of silica

Source: WordNet® 3.1

Etymology

The name refers to the peculiar habit of crystallizing in groups of three individuals.

Noun

tridymite (countable and uncountable, plural tridymites)

(mineral) 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.

Source: Wiktionary

Trid"y*mite, n. Etym: [Gr. (Min.)

Definition: Pure silica, like quartz, but crystallizing in hexagonal tables. It is found in trachyte and similar rocks.

Source: Webster’s Unabridged Dictionary 1913 Edition

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