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Fused Quartz and Silica
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  • fused quartz Crystal quartz that is melted at a white heat and cooled to form an amorphous glass. It is not birefringent and the refractive index is much lower than that of crystal quartz. Fused quartz of optical quality can be prepared by suitable techniques.
  • fused silica Glass consisting of almost pure silicon dioxide (SiO2). Also called vitreous silica. Frequently used in optical fibers and windows.
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