tridymite

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

Noun

 * 1)  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 terms

 * See silicate, silica group

Translations

 * Armenian: տրիդիմիտ
 * Catalan: tridimita
 * Chinese:
 * Mandarin:
 * Finnish:
 * Georgian:
 * German: Tridymit
 * Hungarian:
 * Japanese: 鱗珪石, 鱗石英
 * Polish: trydymit
 * Romanian: tridimit
 * Russian:
 * Spanish: tridimita