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What are the raw materials of optical glass?

Update:30-01-2021
Summary:

The main material is high-quality fused quartz crucible […]

The main material is high-quality fused quartz crucibles sand. Appropriately add auxiliary materials.
Because rare earth zhi has high refractive index, low dispersion and good chemical stability, it can produce optical glass, which can be used to make the lenses of advanced cameras, video cameras, telescopes and other advanced optical instruments. For example, a kind of lanthanum glass with excellent optical properties containing lanthanum oxide lao360% and boron oxide b2o340% is an indispensable optical material for manufacturing high-end camera lenses and periscope lenses. In addition, using the radiation protection properties of some rare earth elements, radiation protection glass can be produced.

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