Oxygen itself is not a mineral. It's an element, the third most abundant in the universe. Minerals are naturally occurring, solid substances with a definite chemical composition and a crystalline structure.

However, oxygen is a crucial component of many minerals! It's found in a vast number of minerals, including:

* Oxides: These minerals contain oxygen bonded to a metal, such as hematite (Fe₂O₃) and quartz (SiO₂).

* Silicates: These minerals are the most abundant group, with oxygen bonded to silicon and other elements, like feldspar (KAlSi₃O₈) and mica (KAl₂(AlSi₃O₁₀)(OH)₂).

* Carbonates: These minerals contain oxygen bonded to carbon, like calcite (CaCO₃) and magnesite (MgCO₃).

* Sulfates: These minerals contain oxygen bonded to sulfur, like gypsum (CaSO₄·2H₂O) and barite (BaSO₄).

* Phosphates: These minerals contain oxygen bonded to phosphorus, like apatite (Ca₅(PO₄)₃(OH,F,Cl)).

So while oxygen itself isn't a mineral, it's a fundamental building block for a vast array of them!