Fused silica, explained by RP Photonics Encyclopedia; silicon dioxide, quartz, vitreous silica, glass, IR-grade, UV-grade, key properties, fabrication, quality, applications
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Tested at Cal tech. 99.797 % pure silica. Pure silica quartz impact glass, like Libyan desert Impact glass pure silica quartz… | Meteorite, Lunar meteorite, Tektite