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Properties of Cryolite Cryolite occurs in a monoclinic crystal state. The cryolite is whitish glassy in colour. The hardness of cryolite in the moh scale is 2.5 to 3. The specific gravity of cryolite is 2.95 to 3. Cryolite is transparent to translucent to transparent in nature due to which its refractive index is very low. Cryolite is invisible in nature, due to a similar refractive index. Cryolite as the essential component of the electrolyte (85 – 90 %) decreases the temperature of the smelting flux electrolysis.