How do simple oxide minerals differ from multiple oxide minerals?

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In the study of oxide minerals, the primary distinction between simple and multiple oxides lies in their chemical composition and structural arrangement:

Simple Oxides: These minerals are composed of a single metal or semimetal combined with oxygen. They are generally categorized by the ratio of metal atoms to oxygen atoms, following the general formula $A_{x} O_{y}$ , where $A$ represents the metal atom and $x$ and $y$ are integers. Examples include periclase (MgO), cuprite (Cu $_{2}$ O), and hematite (Fe $_{2}$ O $_{3}$ ).1
Multiple Oxides: These minerals are characterized by having two nonequivalent metal sites within their structure. They often exhibit more varied chemistry and frequent solid solution. A prominent example is the spinel group, which follows the general formula $A B_{2} O_{4}$ . In this structure, $A$ and $B$ represent ions of different metals, the same metal in different oxidation states, or a combination of both.1