• A novel grading system based on quartz grain transmittance enables rapid assessment of inclusion content, directly correlating with final purity.
• Quartz with fewer inclusions yields higher SiO2 purity (up to 99.998%) and lower impurity levels after purification, as validated by ICP-MS.
• The method links raw quartz inclusion characteristics to the quality of sintered fused quartz products, confirmed by firing tests showing enhanced translucency.
• This approach offers a practical, efficient tool for domestic high-purity quartz exploration, reducing reliance on imports and enhancing resource security.