Cryolite

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A strong fluxing agent with a very low melting point. A good sodium-alumina source in an insoluble form, it is occasionally used as an opacifier for enamels, or to produce crackle glazes. In glazes, cryolite is used as an additive that helps to create artificial reduction in electric firings. This is achieved through cryolite's lack of oxygen.

Chemical Formula: Na₃AlF₆

Synonyms: Kryolite