In which of the following minerals, aluminium is not present?

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 is $N a_{3} A l F_{6}$ .

Mica is $K A l_{3} S i_{3} O_{10} (O H)_{2}$

Feldspars is $K A l S i_{3} O_{8} - N a A l S i_{3} O_{8} - C a A l_{2} S i_{2} O_{8}$ .

Fluorspar is $C a F_{2}$ .

$A l$ is not present in fluorspar.

Hence option $D$ is correct.

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