n. a hard glossy mineral consisting of silicon dioxide in crystal form; present in most rocks (especially sandstone and granite); yellow sand is quartz with iron oxide impurities
常见例句
1
an impure form of quartz consisting of banded chalcedony
2
a transparent purple variety of quartz
3
light-colored and fine-grained granitic rock consisting chiefly of quartz and feldspars
4
n a translucent quartz spangled with bits of mica or other minerals
5
having a pyramid at each of the extremities of a prism, as in quartz crystals.
