However they can be further subdivided into the iridium-group platinum-group elements (IPGEs: Os, Ir, Ru) and the palladium-group platinum-group elements (PPGEs: Rh, Pt, Pd) based on their behaviour in geological systems.
Namun, mereka dapat dibagi lebih lanjut menjadi unsur-unsur golongan platina kelompok iridium (iridium-platinum-group element, IPGE: Os, Ir, Ru) dan unsur-unsur golongan platina kelompok paladium (palladium-platinum-group element, PPGE: Rh, Pt, Pd) berdasarkan perilaku mereka dalam sistem geologi.