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Why was synthetic cryolite developed for aluminum production?

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A color-coded periodic table of the elements displays each element's symbol and atomic number, with categories such as alkali metals, noble gases, halogens, transition metals, and actinoid elements distinguished by different background colors. — halogen Modern version of the periodic table of the elements.

In the Hall-Héroult process, cryolite serves as a vital solvent for bauxite (specifically the alumina extracted from it) during the electrolytic production of aluminum.123

Natural cryolite is a rare mineral, historically found in significant deposits primarily at Ivigtut, Greenland. Because natural supplies are limited and insufficient to meet the demands of large-scale industrial aluminum smelting, synthetic cryolite is manufactured—typically from fluorite—to ensure a consistent and reliable supply for the electrolytic bath.12