Chemistry
Fused quartz is a noncrystalline form of silicon dioxide (SiO2), which is also called silica. (The crystalline form of this material is quartz). Though quartz glass in theory contains only silicon and oxygen, industrially produced quartz glass / fused silica contains impurities. The typical impurities depend on the starting material and the process used. The most dominant impurities are aluminium and titanium.
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