tridymite
/ˈtrɪdɪmaɪt/noun
mass noun
- a high-temperature form of quartz found as thin hexagonal crystals in some igneous rocks and stony meteorites鳞石英。
词源
mid 19th cent.: from German Tridymit, from Greek tridumos 'threefold', from tri- 'three' + -dumos（as in didumos 'twin'）, because of its occurrence in groups of three crystals.