quartz

石英

The riverbed was full of small pieces of white quartz.

河床上布满了白色的小石英碎块。

石英表、石英钟口语

He still wears an old quartz his father gave him.

他还戴著父亲给他的那只旧石英表。

石英的、石英制的

A quartz watch keeps better time than a mechanical one.

石英表走时比机械表准确。