Definition of tridymite in English:
- 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.
- US English dictionary
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