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tridymite Syllabification: trid·y·mite
Pronunciation: /ˈtridəˌmīt/

Definition of tridymite in English:


A high-temperature form of quartz found as thin hexagonal crystals in some igneous rocks and stony meteorites.
Example sentences
  • Although the optical, SEM, and XRD data are consistent with quartz, considering the incongruous crystal symmetry, it is likely that this mineral is actually a quartz pseudomorph after tridymite.
  • The abundant and ubiquitous quartz paramorphs after tridymite in the walls attest to a very shallow emplacement depth.
  • Quartz paramorphs after tridymite are absent from Fiachanis but present in the three Priomh-lochs samples adjacent to late minor intrusions.


Mid 19th century: from German Tridymit, from Greek tridumos 'threefold', from tri- 'three' + -dumos (as in didumos 'twin'), because of its occurrence in groups of three crystals.

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