Identify the incorrect pair from the following :

We need to identify the incorrect pair of mineral name and chemical formula.

Check each pair.

Option (1): Fluorspar - $$BF_3$$

This is INCORRECT. Fluorspar (also called fluorite) is $$CaF_2$$ (calcium fluoride), NOT $$BF_3$$ (boron trifluoride). $$BF_3$$ is a gaseous compound, not a mineral. Fluorspar is a naturally occurring mineral and is the principal source of fluorine and hydrofluoric acid.

Option (2): Cryolite - $$Na_3AlF_6$$

This is correct. Cryolite is sodium hexafluoroaluminate, used as a flux in the electrolytic extraction of aluminium (Hall-Heroult process).

Option (3): Fluoroapatite - $$3Ca_3(PO_4)_2 \cdot CaF_2$$

This is correct. Fluoroapatite is a phosphate mineral containing fluoride, found in teeth and bones.

Option (4): Carnallite - $$KCl \cdot MgCl_2 \cdot 6H_2O$$

This is correct. Carnallite is a hydrated potassium magnesium chloride mineral, an important source of potassium.

The incorrect pair is Option (1): Fluorspar - $$BF_3$$.