simple oxide

An oxide mineral is an inorganic compound formed by oxygen atoms packed closely together, with smaller metal or other ions fitting into the spaces between them. These are distinct from other oxygen-bearing compounds like silicates or carbonates, where oxygen atoms are covalently bonded to another element.1

Oxides are classified into two main types:
* Simple oxides: These contain a single metal combined with oxygen in various ratios, such as XO, X₂O, X₂O₃, or XO₂. Examples include periclase (MgO) and hematite (Fe₂O₃).12
* Multiple oxides: These have two different metal sites and often follow the formula XY₂O₄, like the spinel group (e.g., MgAl₂O₄).12

Oxide minerals generally exhibit strong ionic bonding, making them relatively hard and dense. Many are economically important as ores for metals like iron, chromium, manganese, tin, and uranium.2