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| Oxides | |||
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Cassiterite SnO2 tin ore from Graupen, Erzgebirge, Germany. |
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Chromite FeCr2O4 chrome iron ore from the Ural Mountains, Russia. |
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Chrysoberyl BeAl2O4 gold beryl from Helsingfors, Finland. |
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Columbite (Fe,Mn)(Nb,Ta)2O6 crystal from the Black Hills, South Dakota, USA. |
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Corundum Al2O3 artificial sapphire and ruby from Germany. |
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Corundum Al2O3 gem placer from South-West Africa. |
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Corundum Al2O3 sapphire and ruby from Rakwana, Ceylon. |
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Cuprite CuO ruby copper ore with malachite from Chessy, France. |
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Hausmannite Mn3O4 crystal from Öhrenstock, Thuringian Wood, Germany. |
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Hematite Fe2O3 red iron ore from the Knollengrube, Bad Lauterberg, Hartz Mountains, Germany. |
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Hematite Fe2O3 red iron ore from the Knollengrube, Bad Lauterberg, Hartz Mountains, Germany. |
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Hematite Fe2O3 iron glance and quartz from Cleator District, Whitehaven, Cumberland, Great Britain. |
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Ilmenite FeTiO3 titanic iron ore from Egersund, Norway. |
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Magnetite Fe3O4 magnetic iron ore from Hargreavis, Brazil. |
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Manganomelane MnO2 fibrous manganese oxide from the Siegerland, Germany. |
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Pyrolusite MnO2 black manganese from Elgersburg, Thuringia, Germany. |
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Rutile TiO2 crystals from Magnet Cove, Arkansas, USA. |
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Samarskite (Y,Er)4[NbO7]3 crystals from Satersdalen, Norway. |
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Spinel MgAl2O4 crystals from Vaskö, Hungary. |
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Tantalite (Fe,Mn)(Ta,Nb)2O6 aggregate from the Erengo Mountains, South-West Africa. |
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Thorianite ThO2 idiomorphic crystals from Hinidum Pattu, Ceylon. |
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Zinkite ZnO spartalite with franklinite from Odgenburg, New Jersey, USA. |
| Hydroxides | |||
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Bauxite AlOOH fine-grained bauxite minerals from Bouches du Rhone, France. |
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Goethite FeOOH fibrous brown iron ore from Schönbrunn, Saxony, Germany. |
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Goethite FeOOH limonite from Minas Gerais, Brazil. |
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Goethite FeOOH pseudomorphs of limonite after pyrite from Vlotho at the Weser, Germany. |
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Lepidokrocite FeOOH needle iron-stone from the Grube Rossbach, Westerwald, Germany. |
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Manganite MnOOH idiomorphic crystals from Ilfeld, Hartz Mountains, Germany. |
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