tridymite
/ˈtrɪdɪmʌɪt
/noun [mass noun]
A high-temperature form of quartz found as thin hexagonal crystals in some igneous rocks and stony meteorites.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.
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.
- pyrosmalite
- Pyrosoma
- pyrosome
- pyrosphere
- pyrostat
- pyrostilpnite
- pyrosulfate
- pyrosulphate
- pyrosulphuric acid
- pyrosynthesis
- pyrosynthetic
- pyrotartaric
- pyrotartaric acid
- pyrotartrate
- pyrotartrimide
- pyrotechnian
- pyrotechnic
- pyrotechnical
- pyrotechnically
- pyrotechnician
- pyrotechnics
- pyrotechnist
- pyrotechny
- Pyrotenax
- pyroterebic