… Quartz (other than natural sands); quartzite, whether or not roughly trimmed or merely cut, by …
Explanatory notes
… 25.06 ‑ Quartz (other than natural sands); quartzite, whether or not roughly trimmed or merely cut, by … excluded ( heading 71.03 ), even if intended to be used for technical purposes, e.g., as piezo‑electric quartz or for … if merely shaped or processed as specified in the heading text. The heading also excludes : (a) Natural quartz sand ( …