Technical assessment of European high-purity quartz (HPQ) resources and their viability as feedstocks for semiconductor, solar PV, and fibre optic manufacturing, where purity thresholds are among the most demanding in industrial production. The paper surveys known European occurrences against commercial HPQ specifications, finding a supply landscape that is geographically concentrated and largely underdeveloped relative to demand projections driven by the EU’s semiconductor and solar expansion ambitions. With few viable substitutes and China dominant in processed quartz supply, the material presents a supply risk profile that the EU’s CRM methodology is poorly positioned to capture for the same reason it misses other domestically scarce foundational minerals.