Cryolite belongs to the Fluorine group and out of the four options, florine is the only halide present. So, we can say that cryolite is the best example of a halide ore.

Is cryolite a halide?

Cryolite, colourless to white halide mineral, sodium aluminum fluoride (Na₃AlF₆). It occurs in a large deposit at Ivigtut, Greenland, and in small amounts in Spain, Colorado, U.S., and elsewhere.

Which is the ore of cryolite?

It was historically used as an ore of aluminium and later in the electrolytic processing of the aluminium-rich oxide ore bauxite (itself a combination of aluminium oxide minerals such as gibbsite, boehmite and diaspore).