The oxide minerals all contain one or more oxide anions (O-2).  The oxide minerals include species that are hydroxy-oxides.  The hydroxide minerals (those with one or more OH-) are usually considered together with the oxides.  Many sulfide minerals are not stable in Earth-surface conditions.  In the presence of oxygen and moisture, sulfide minerals tend to tarnish or alter to oxides and hydroxy-oxides.  All except the most inert elements (such as the platinum-group elements and gold and noble gases) readily form oxides.  Gold oxide forms only under special conditions.


  Hematite (Fe2O3)


  Magnetite (Fe3O4)


  Goethite (FeO·OH)


  Limonite (FeO·OH·nH2O)


  Turgite (2Fe2O3·H2O)


  Corundum (Al2O3) (corundum, sapphire, ruby)


  Gahnite (ZnAl2O4)


  Cuprite (Cu2O)


  Tenorite (CuO)


  Rutile (TiO2)


  Franklinite ((Zn,Fe,Mn)(Fe,Mn)2O4)


  Zincite (ZnO)


  Pyrolusite (MnO2)


  Romanechite (BaMn+2Mn+48O16(OH)4)


  Ferrocolumbite (FeNb2O6)


  Minium (Pb3O4)



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