| Natanite | Fe2+[Sn(OH)6] |
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| 'Natro-glauconite' | (Na,K)(Fe3+,Al,Mg)2((Si,Al)4O10)(OH)2 |
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| Natrodufrénite | NaFe2+Fe53+(PO4)4(OH)6 · 2H2O |
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| Natrojarosite | NaFe3(SO4)2(OH)6 |
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| Natropharmacosiderite | NaFe43+(AsO4)3(OH)4 · 4H2O |
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| Natrowalentaite | [Fe3+0.5Na0.5(H2O)6][NaAs23+(Fe3+2.33W6+0.67)(PO4)2O7] |
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| Navajoite | Fe3+V95+O24 · 12H2O |
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| Nealite | Pb4Fe2+(As3+O3)2Cl4 · 2H2O |
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| Nelenite | (Mn,Fe)16(Si12O30)(OH)14[As33+O6(OH)3] |
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| Neotocite | (Mn,Fe,Mg)SiO3 · H2O |
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| Neskevaaraite-Fe | K3Na2Fe2+(Ti,Nb)4(Si4O12)2(O,OH)4 · 5-6 H2O |
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| Neustädtelite | Bi2Fe3+(Fe3+,Co)(AsO4)2(O,OH)4 |
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| 'Ni-Serpentine' | D3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn |
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| 'Nickel-bearing Serpentine' | D3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn |
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| Nickeltsumcorite | Pb(Ni,Fe3+)2(AsO4)2(H2O,OH)2 |
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| Nigelcookite | PbFe22+V23+(PO4)3(OH)3 |
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| 'Nigerite-6H' | (Zn,Mg,Fe2+)(Sn,Zn)2(Al,Fe3+)12O22(OH)2 |
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| Nikischerite | Fe62+Al3(OH)18[Na(H2O)6](SO4)2 · 6H2O |
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| Nikmelnikovite | Ca12(Fe2+Fe33+Al3◻)[SiO4]6[◻(OH)4]5◻4 |
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| 'Nioboaeschynite-(Nd)' | (Nd,Ce,Ca,Th)(Nb,Ti,Fe,Ta)2(O,OH)6 |
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| Nioboaeschynite-(Y) | (Y,REE,Ca,Th,Fe)(Nb,Ti,Ta)2(O,OH)6 |
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| Niobophyllite | (K,Na)3(Fe,Mn)6(Nb,Ti)2Si8(O,OH,F)31 |
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| Nipeiite-(Ce) | Ce9Fe3+(SiO4)6[SiO3(OH)](OH)3 |
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| Nolanite | V83+Fe23+O14(OH)2 |
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| Nontronite | Na0.3Fe2((Si,Al)4O10)(OH)2 · nH2O |
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| Oberwolfachite | SrFe33+(AsO4)(SO4)(OH)6 |
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| Obradovicite-KCu | [K2(H2O)17Cu(H2O)6][Mo8As2Fe33+O34(OH)3] |
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| Obradovicite-NaCu | Na2(H2O)17Cu(H2O)6][Mo8As2Fe33+O34(OH)3] |
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| Obradovicite-NaNa | [Na2(H2O)16Na(H2O)6][Mo8As2Fe33+O33(OH)4] |
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| Odinite | (Fe,Mg,Al,Fe,Ti,Mn)2.4((Si,Al)2O5)(OH)4 |
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| Ogdensburgite | Ca2Fe43+(Zn,Mn2+)(AsO4)4(OH)6 · 6H2O |
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| Ohmilite | Sr3(Ti,Fe3+)(Si4O12)(O,OH) · 2-3H2O |
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| Ojuelaite | ZnFe23+(AsO4)2(OH)2 · 4H2O |
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| 'Okhotskite-(Mg)' | Ca8(Mn2+,Mg)(Mn3+,Al,Fe3+)(SiO4)(Si2O7)(OH)2 · H2O |
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| Oldsite | K2Fe2+[(UO2)(SO4)2]2(H2O)8 |
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| Olmsteadite | KFe22+(Nb5+,Ta5+)(PO4)2O2 · 2H2O |
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| Omsite | Ni2Fe3+(OH)6[Sb(OH)6] |
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| Oneillite | Na15Ca3Mn3Fe32+Zr3Nb(Si25O73)(O,OH,H2O)3(OH,Cl)2 |
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| Ophirite | Ca2Mg4[Zn2Mn23+(H2O)2(Fe3+W9O34)2] · 46H2O |
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| Örebroite | Mn32+(Sb5+,Fe3+)(SiO4)(O,OH)3 |
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| 'Örebroite-III' | Mn62+(Fe3+,Sb5+)2Si2(O,OH)14 |
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| 'Örebroite-VIII' | Mn62+(Fe3+,Sb5+,As)Si2(O,OH)14 |
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| Orickite | 2CuFeS2 · H2O |
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| 'Orthochamosite' | (Fe2+,Mg,Fe3+)5Al(AlSi3O10)(OH,O)8 |
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| Orthojoaquinite-(Ce) | NaBa2Ce2FeTi2[Si4O12]2O2(O,OH) · H2O |
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| Orthojoaquinite-(La) | NaBa2La2Fe2+Ti2[Si4O12]2O2(O,OH) · H2O |
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| Ottrélite | (Mn2+,Fe2+,Mg)Al2(SiO4)O(OH)2 |
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| Oxy-foitite | ◻(Fe2+Al2)Al6(Si6O18)(BO3)3(OH)3O |
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| Oxy-schorl | Na(Fe22+Al)Al6(Si6O18)(BO3)3(OH)3O |
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| Oxykinoshitalite | (Ba,K)(Mg,Ti,Fe3+,Fe2+)3((Si,Al)4O10)(O,OH,F)2 |
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