Quartz (Other Than Natural Sands)

Quartz in forms other than natural sand — including crushed, sized, and artificially processed quartz — is a critical input for the semiconductor, solar panel, and specialty glass industries, where ultra-high purity is paramount. The US schedule distinguishes artificial quartz sands meeting specific silica and iron oxide thresholds (2506100010) from other quartz forms (2506100050), with purity and processing method driving classification. Turkey leads US import supply, followed by Canada and Norway, with India and China also notable sources. Importers should be aware that Chinese-origin quartz may be subject to Section 301 tariffs.