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melting natural quartz in a vacuum or an inert atmosphere.
* Type II is produced by fusing quartz crystal powder in a high-temperature flame.
* Type III is produced by burning SiCl₄ in a hydrogen-oxygen flame.
* Type IV is produced by burning SiCl₄ in a water vapor-free plasma flame.Quartz contains only silicon and oxygen, although commercial quartz glass often contains impurities. Two dominant

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