Definition of tridymite in English:

tridymite

noun ˈtrɪdɪmʌɪtˈtridəˌmīt

mass noun

A high-temperature form of quartz found as thin hexagonal crystals in some igneous rocks and stony meteorites.
Example sentencesExamples
- 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.
- Because there is a significant difference in crystal structure among the three forms, cooling tridymite or crystoballite below 572°F results in metastable forms that retain the high temperature structure.

Origin

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.

Definition of tridymite in US English:

tridymite

nounˈtridəˌmīt

A high-temperature form of quartz found as thin hexagonal crystals in some igneous rocks and stony meteorites.
Example sentencesExamples
- Because there is a significant difference in crystal structure among the three forms, cooling tridymite or crystoballite below 572°F results in metastable forms that retain the high temperature structure.
- The abundant and ubiquitous quartz paramorphs after tridymite in the walls attest to a very shallow emplacement depth.
- 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.
- Quartz paramorphs after tridymite are absent from Fiachanis but present in the three Priomh-lochs samples adjacent to late minor intrusions.

Origin

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.

单词	tridymite
释义	Definition of tridymite in English: tridymite noun ˈtrɪdɪmʌɪtˈtridəˌmīt mass noun A high-temperature form of quartz found as thin hexagonal crystals in some igneous rocks and stony meteorites. Example sentencesExamples 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. Because there is a significant difference in crystal structure among the three forms, cooling tridymite or crystoballite below 572°F results in metastable forms that retain the high temperature structure. Origin 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. Definition of tridymite in US English: tridymite nounˈtridəˌmīt A high-temperature form of quartz found as thin hexagonal crystals in some igneous rocks and stony meteorites. Example sentencesExamples Because there is a significant difference in crystal structure among the three forms, cooling tridymite or crystoballite below 572°F results in metastable forms that retain the high temperature structure. The abundant and ubiquitous quartz paramorphs after tridymite in the walls attest to a very shallow emplacement depth. 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. Quartz paramorphs after tridymite are absent from Fiachanis but present in the three Priomh-lochs samples adjacent to late minor intrusions. Origin 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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