A very common oxide mineral is hematite. It's the main source of iron ore and has the chemical formula Fe₂O₃. Hematite is found in a variety of colors, including red, brown, black, and silver.

Other common oxide minerals include:

* Magnetite (Fe₃O₄): A black mineral that is magnetic.

* Corundum (Al₂O₃): A hard mineral that includes gemstones like ruby and sapphire.

* Quartz (SiO₂): A very common mineral that comes in many forms, including sand.

Let me know if you'd like to know more about any specific oxide mineral!