aluminum
The overwhelming majority of aluminum on earth is mined from a mineral called Bauxite. Once the aluminum is smelted out, it is no longer a mineral - it is an element: Aluminum.
It is a metallic mineral.
Sapphire is a form of aluminum oxide - alpha Al2O3.
Aluminum is considered a trace mineral. Trace amounts of aluminum are commonly found in foods, but it is harmless in the natural form when eaten in moderation. Elemental aluminum can be toxic.
Aluminum is mostly found in the Earth's crust as bauxite, a type of rock. It is also found in various minerals, clays, and gemstones.
bauxite
Ruby and sapphire are both gem varieties of the mineral corundum, an aluminum oxide.
Aluminum is an element, a metal, etc. Not a mineral
Elemental mineral
Aluminum is a mineral. It begins with the letter A.
Bauxite is not a mineral, but a rock (aluminum ore), and is a mixture of aluminum, iron and some other minerals.