Question

what makes the ore bauxite special?
it contains a usable amount of aluminum.
it is brittle.
it is a gem - bearing mineral.
it has a low melting point.

Explanation:

Bauxite is an ore of aluminum. Ores are minerals or rocks that contain a sufficient amount of a metal or other valuable substance to make it economically worthwhile to extract. Bauxite is special because it contains a usable amount of aluminum. Brittle is a property that many minerals can have and is not specific to bauxite's significance as an ore. Gem - bearing minerals are those that contain gemstones like diamonds, rubies etc., which bauxite is not. Also, bauxite does not have a particularly low melting point compared to its significance as an aluminum - containing ore.

Answer:

It contains a usable amount of aluminum.