| Magnussonite | Mn102+(As3+O3)6(OH,Cl)2 |
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| Mahnertite | NaCu3(AsO4)2Cl · 5H2O |
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| Mallestigite | Pb3Sb5+(SO4)(AsO4)(OH)6 · 3H2O |
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| Manganarsite | Mn3(As2O4)(OH)4 |
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| Manganberzeliite | (NaCa2)Mn22+(AsO4)3 |
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| Manganlotharmeyerite | CaMn23+(AsO4)2(OH)2 |
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| Manganobadalovite | NaNaMn(MgFe3+)(AsO4)3 |
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| Manganohatertite | NaNaCa(MnFe3+)(AsO4)3 |
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| Manganohörnesite | Mn32+(AsO4)2 · 8H2O |
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| Manganostibite | (Mn,Fe)7SbAsO12 |
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| Mansfieldite | AlAsO4 · 2H2O |
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| Mapimite | Zn2Fe33+(AsO4)3(OH)4 · 10H2O |
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| Mauriziodiniite | (NH4)(As2O3)2I |
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| Mawbyite | PbFe23+(AsO4)2(OH)2 |
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| Maxwellite | NaFe3+(AsO4)F |
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| Mcgovernite | Mn19Zn3(AsO4)3(AsO3)(SiO4)3(OH)21 |
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| Mcnearite | NaCa5(AsO4)(HAsO4)4 · 4H2O |
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| Medenbachite | Bi2Fe3+Cu2+(AsO4)2O(OH)3 |
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| Melanarsite | K3Cu7Fe3+O4(AsO4)4 |
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| Metaheinrichite | Ba(UO2)2(AsO4)2 · 8H2O |
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| Metakahlerite | Fe2+(UO2)2(AsO4)2 · 8H2O |
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| Metakirchheimerite | Co(UO2)2(AsO4)2 · 8H2O |
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| Metaköttigite | (Zn,Fe,Fe)3(AsO4)2 · 8(H2O,OH) |
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| Metalodèvite | Zn(UO2)2(AsO4)2 · 10H2O |
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| Metanováčekite | Mg(UO2)2(AsO4)2 · 8H2O |
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| Metarauchite | Ni(UO2)2(AsO4)2 · 8H2O |
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| Metauranospinite | Ca(UO2)2(AsO4)2 · 8H2O |
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| Metazeunerite | Cu(UO2)2(AsO4)2 · 8H2O |
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| Miguelromeroite | MnMn2Mn2(AsO4)2(HAsO4)2 · 4H2O |
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| Milkovoite | Cu4O(PO4)(AsO4) |
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| Mimetite | Pb5(AsO4)3Cl |
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| Mixite | BiCu6(AsO4)3(OH)6 · 3H2O |
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| Molybdofornacite | Pb2Cu(MoO4,CrO4)(AsO4,PO4)(OH) |
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| Monteneroite | Cu2+Mn22+(AsO4)2 · 8H2O |
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| Morelandite | Ca2Ba3(AsO4)3Cl |
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| Morrisonite | Ca11(As3+V24+V105+As65+O51)2 · 78H2O |
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| Naalasite | NaAl(AsO3OH)2 · H2O |
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| Nafeasite | Na3Fe33+(AsO3OH)6 · 3H2O |
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| Nanlingite | Na(Ca5Li)Mg12(AsO3)2[Fe(AsO3)6]F14 |
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| Natropharmacoalumite | NaAl4(AsO4)3(OH)4 · 4H2O |
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| Natropharmacosiderite | NaFe43+(AsO4)3(OH)4 · 4H2O |
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| Natrouranospinite | Na2(UO2)2(AsO4)2 · 5H2O |
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| Natrowalentaite | [Fe3+0.5Na0.5(H2O)6][NaAs23+(Fe3+2.33W6+0.67)(PO4)2O7] |
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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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| Neustädtelite | Bi2Fe3+(Fe3+,Co)(AsO4)2(O,OH)4 |
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| Niasite | Ni2+4.5(AsO4)3 |
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| Nickelaustinite | CaNi(AsO4)(OH) |
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| Nickellotharmeyerite | CaNi2(AsO4)2 · 2H2O |
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| Nickelschneebergite | BiNi2(AsO4)2(OH) · H2O |
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