Aluminium is not present in which of the following minerals ?

Cryolite

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Mica

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Feldspar

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Fluorspar

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Solution

The correct option is D Fluorspar
Cryolite; $N a_{3} A l F_{6}$ , sodium hexafluoroaluminate.
Mica: $K A l_{3} S i_{3} O 10 (O H)_{2}$ Basic potassium aluminum silicate
Feldspars $K A l S i_{3} O_{8} N a A l S i_{3} O_{8} C a A l_{2} S i_{2} O_{8}$ .
fluorspar: $C a F_{2}$ ,calcium fluoride.
So only in fluorspar there is no Al present.
Hence option D is correct.

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