| Mengxianminite | (Ca,Na)2Sn2(Mg,Fe)3Al8[(BO3)(BeO4)O6]2 |
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| Menzerite-(Y) | (Y2Ca)Mg2(SiO4)3 |
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| Meridianiite | MgSO4 · 11H2O |
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| Merrillite | Ca9NaMg(PO4)7 |
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| Merwinite | Ca3Mg(SiO4)2 |
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| Metanováčekite | Mg(UO2)2(AsO4)2 · 8H2O |
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| Metasaléeite | Mg(UO2)2(PO4)2 · 8H2O |
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| Michalskiite | Fe3+1.33Cu22+(MgFe3+)2(VO4)6 |
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| Midbarite | Ca3Mg2(V2Si)O12 |
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| Milanriederite | (Ca18[REE])Fe3+Al4(Mg4Al4)(◻4)◻[Si2O7]4[(SiO4)10](OH)(OH)9 |
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| Mirnyite | SrZr4+Mg2(Cr63+Ti124+)O38 |
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| Mizraite-(Ce) | Ce(Al11Mg)O19 |
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| Molybdophyllite | Pb8Mg9[Si10O28(OH)8O2(CO3)3] · H2O |
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| Montdorite | (K,Na)2(Fe2+,Mn2+,Mg)5(Si4O10)2(OH,F)4 |
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| Montgomeryite | Ca4MgAl4(PO4)6(OH)4 · 12H2O |
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| Monticellite | CaMgSiO4 |
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| Montmorillonite | (Na,Ca)0.33(Al,Mg)2(Si4O10)(OH)2 · nH2O |
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| Mooreite | Mg9◻2Mn2Zn4(SO4)2(OH)26 · 8H2O |
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| Moraskoite | Na2Mg(PO4)F |
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| Motukoreaite | Mg6Al3(OH)18[Na(H2O)6][SO4]2 · 6H2O |
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| Mountkeithite | [(Mg1-xFex3+)(OH)2][SO4]x/2 · nH2O |
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| Muskoxite | Mg7Fe4O13 · 10H2O |
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| Nanlingite | Na(Ca5Li)Mg12(AsO3)2[Fe(AsO3)6]F14 |
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| Neotocite | (Mn,Fe,Mg)SiO3 · H2O |
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| Nepskoeite | Mg4Cl(OH)7 · 6H2O |
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| Nesquehonite | MgCO3 · 3H2O |
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| Newberyite | Mg(PO3OH) · 3H2O |
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| Niahite | (NH4)(Mn2+,Mg)(PO4) · H2O |
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| Nickelblödite | Na2(Ni,Mg)(SO4)2 · 4H2O |
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| Nickenichite | Na0.8Ca0.4Cu0.4(Mg,Fe)3(AsO4)3 |
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| Nimite | (Ni,Mg,Al)6((Si,Al)4O10)(OH)8 |
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| Nissonite | Cu2Mg2(PO4)2(OH)2 · 5H2O |
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| Nitromagnesite | Mg(NO3)2 · 6H2O |
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| Nollmotzite | Mg[U5+(U6+O2)2O4F3] · 4H2O |
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| Norbergite | Mg3(SiO4)F2 |
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| Nordite-(Ce) | (Ce,La)(Sr,Ca)Na2(Na,Mn)(Zn,Mg)Si6O17 |
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| Nordite-(La) | (La,Ce)(Sr,Ca)Na2(Na,Mn)(Zn,Mg)Si6O17 |
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| Norsethite | BaMg(CO3)2 |
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| Northupite | Na3Mg(CO3)2Cl |
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| Nováčekite | Mg(UO2)2(AsO4)2 · 10H2O |
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| Novograblenovite | (NH4)MgCl3 · 6H2O |
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| Nybøite | NaNa2(Mg3Al2)(AlSi7O22)(OH)2 |
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| O'Danielite | Na(Zn,Mg)3(AsO4)(AsO3OH)2 |
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| Odinite | (Fe,Mg,Al,Fe,Ti,Mn)2.4((Si,Al)2O5)(OH)4 |
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| Offretite | KCaMg(Si13Al5)O36 · 15H2O |
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| Okieite | Mg3[V10O28] · 28H2O |
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| Ominelite | (Fe2+,Mg)(Al,Fe3+)3(SiO4)(BO3)O2 |
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| Omphacite | (NaaCabFec2+Mgd)(AleFef3+Feg2+Mgh)Si2O6 |
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| Ophirite | Ca2Mg4[Zn2Mn23+(H2O)2(Fe3+W9O34)2] · 46H2O |
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| Orthopinakiolite | (Mg,Mn2+)2Mn3+(BO3)O2 |
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