Which one of the following mineral does not contain oxygen ? A. Haematite B. Bauxite C. Cryolite D. Calcite

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Haematite
Bauxite
Cryolite
Calcite

The correct answer is C. Cryolite.

Haematite is an iron oxide mineral with the chemical formula Fe2O3. Bauxite is an aluminium ore

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with the chemical formula Al2O3.2H2O. Calcite is a calcium carbonate mineral with the chemical formula CaCO3. Cryolite is a sodium aluminium fluoride mineral with the chemical formula Na3AlF6.

As you can see, cryolite is the only mineral in the list that does not contain oxygen.

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