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This list gives an overview of the classification of minerals - silicates and includes mostly IMA recognized minerals and its groupings. This list complements the alphabetical list on List of minerals (complete) and List of minerals. Rocks, ores, mineral mixtures, not IMA approved minerals, not named minerals are mostly excluded. Mostly major groups only, or groupings used by New Dana Classification and Mindat.

Classification of minerals

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Introduction

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The grouping of the New Dana Classification and of the mindat.org is similar only, and so this classification is an overview only. Consistency is missing too on the group name endings (group, subgroup, series) between New Dana Classification and mindat.org.

  • Abbreviations:
    • "*" - Mineral Name not IMA Approved.
    • "?" - IMA Discredited Mineral Name.

Category 09

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Class: Phyllosilicates

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Class: Inosilicates

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Pyroxene supergroup
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Amphibole supergroup
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Sapphirine supergroup
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Class: Cyclosilicates

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  • Category:Cyclosilicates
    • Tourmaline group
      • Alkali-Deficient Tourmaline subgroup - Foitite subgroup
        • Foitite [ ][(Fe2+)2(Al,Fe3+)][Al6][(OH)3|OH|(BO3)3|Si6O18], Magnesiofoitite [ ][Mg2(Al,Fe3+)][Al6][(OH)3|OH|(BO3)3|Si6O18], Rossmanite [ ][LiAl2][Al6][(OH)3|OH|(BO3)3|Si6O18], Oxy-Rossmanite [ ][LiAl2]Al6(OH)3O(BO3)3[Si6O18]
      • Calcic Tourmaline subgroup - Liddicoatite subgroup
        • Liddicoatite [Ca][Li2Al][Al6][(OH)3|F|(BO3)3|Si6O18], Uvite CaMg3(Al5Mg)(Si6O18)(BO3)3(OH)4, Feruvite [Ca][(Fe2+,Mg)3][MgAl5][(OH)3|F|(BO3)3|Si6O18], Hydroxyuvite (IMA2000-030 was not approved, but suspended) CaMg3(Al5Mg)(Si6O18)(BO3)3(OH)3(OH)
      • Ferric Tourmaline subgroup - Buergerite subgroup
        • Buergerite [Na][(Fe3+)3][Al6][O3|F|(BO3)3|Si6O18], Povondraite [Na][(Fe3+)3][(Fe3+)4Mg2][(OH)3|O|(BO3)3|Si6O18]
      • Lithian Tourmaline subgroup - Elbaite subgroup
        • Olenite NaAl9B3Si6O27O3OH, Oxy-Dravite Na(MgAl2)(MgAl5)Si6O18(BO3)3(OH)3O, Elbaite Na(Al1.5Li1.5)Al6(OH)3(OH)(BO3)3Si6O18
      • Sodic Tourmaline subgroup - Schorl subgroup
        • Dravite [Na][Mg3][Al6][(OH)3|OH|(BO3)3|Si6O18], Fluor-Dravite NaMg3Al6(OH)3F(BO3)3(Si6O18), Schorl [Na][(Fe2+)3][Al6][(OH)3|OH|(BO3)3|Si6O18], Schorl-(F) [Na][(Fe2+)3][Al6][(OH)3|F,OH|(BO3)3|Si6O18], Chromdravite [Na][Mg3][(Cr3+,Fe3+)6][(OH)3|OH|(BO3)3|Si6O18], Vanadiumdravite [Na][Mg3][(V3+)6][(OH)3|OH|(BO3)3|Si6O18]
    • Eudialyte group
      • Carbokentbrooksite (Na,[ ])12(Na,Ce)3Ca6Mn3Zr3Nb(Si25O73)(OH)3(CO3)•H2O
      • Eudialyte Na4(Ca,Ce)2(Fe2+,Mn,Y)ZrSi8O22(OH,Cl)2 (?)
      • Feklichevite Na11Ca9(Fe3+,Fe2+)2Zr3Nb[Si25O73](OH,H2O,Cl,O)5
      • Ferrokentbrooksite Na15Ca6(Fe,Mn)3Zr3NbSi25O73(O,OH,H2O)3(Cl,F,OH)2
      • Georgbarsanovite Na12(Mn,Sr,REE)3Ca6(Fe2+)3Zr3NbSi25O76Cl2•H2O
      • Golyshevite (Na,Ca)10Ca9(Fe3+,Fe2+)2Zr3NbSi25O72(CO3)(OH)3•H2O
      • Ikranite (Na,H3O)15(Ca,Mn,REE)6(Fe3+)2Zr3([ ],Zr)([ ],Si)Si24O66(O,OH)6Cl•2-3H2O
      • Johnsenite-(Ce) Na12(Ce,REE,Sr)3Ca6Mn3Zr3W(Si25O73)(CO3)(OH,Cl)2
      • Kentbrooksite (Na,REE)15(Ca,REE)6Mn2+Zr3NbSi25O74F2•2H2O
      • Khomyakovite Na12Sr3Ca6Fe3Zr3W(Si25O73)(O,OH,H2O)3(OH,Cl)2
      • Manganokhomyakovite Na12Sr3Ca6Mn3Zr3W(Si25O73)(O,OH,H2O)3(OH,Cl)2
      • Mogovidite Na9(Ca,Na)6Ca6Fe2Zr3[ ]Si25O72(CO3)(OH)4
      • Oneillite Na15Ca3Mn3(Fe2+)3Zr3Nb(Si25O73)(O,OH,H2O)3(OH,Cl)2
      • Raslakite Na15Ca3Fe3(Na,Zr)3Zr3(Si,Nb)(Si25O73)(OH,H2O)3(Cl,OH)
      • Rastsvetaevite Na27K8Ca12Fe3Zr6Si52O144(O,OH,H2O)6Cl2
      • Taseqite Na12Sr3Ca6Fe3Zr3NbSi25O73(O,OH,H2O)3Cl2
      • Zirsilite-(Ce) (Na,[ ])12(Ce, Na)3Ca6Mn3Zr3Nb(Si25O73)(OH)3(CO3)•H2O
      • Alluaivite Na19(Ca,Mn2+)6(Ti,Nb)3(Si3O9)2(Si10O28)2Cl•2H2O
      • Andrianovite Na12(K,Sr,Ce)3Ca6Mn3Zr3Nb(Si25O73)(O,H2O,OH)5
      • Aqualite (H3O)8(Na,K,Sr)5Ca6Zr3Si26O66(OH)9Cl
      • Dualite Na30(Ca,Na,Ce,Sr)12(Na,Mn,Fe,Ti)6Zr3Ti3MnSi51O144(OH,H2O,Cl)9
      • Labyrinthite (Na,K,Sr)35Ca12Fe3Zr6TiSi51O144(O,OH,H2O)9Cl3, Mills et al. (2009)

Class: Nesosilicates

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Nesosilicates - Garnet supergroup
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Nesosilicates - Humite supergroup
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Class: Sorosilicates

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  • Category:Sorosilicates
    • Epidote supergroup, {A2}{M3}[O|OH|SiO4|Si2O7]
      • Epidote group
        • Clinozoisite {Ca2}{Al3}[O|OH|SiO4|Si2O7], Clinozoisite-(Sr) CaSrAl3(Si2O7)(SiO4)O(OH), Epidote {Ca2}{Al2Fe3+}[O|OH|SiO4|Si2O7], Epidote-(Pb) CaPbFe3+Al2(Si2O7)(SiO4)O(OH), Mukhinite {Ca2}{Al2V3+}[O|OH|SiO4|Si2O7], Piemontite {Ca2}{Al2Mn3+}[O|OH|SiO4|Si2O7], Piemontite-(Sr) {CaSr}{Al2Mn3+}[O|OH|SiO4|Si2O7], Manganipiemontite-(Sr) {CaSr}{Mn3+AlMn3+}[O|OH|SiO4|Si2O7]
      • Allanite group
        • Allanite-(Ce) {CaCe}{Al2Fe2+}[O|OH|SiO4|Si2O7], Allanite-(La) {CaLa}{Al2Fe2+}[O|OH|SiO4|Si2O7], Allanite-(Y) {CaY}{Al2Fe2+}[O|OH|SiO4|Si2O7], Dissakisite-(Ce) {CaCe}{Al2Mg}[O|OH|SiO4|Si2O7], Dissakisite-(La) {CaLa}{Al2Mg}[O|OH|SiO4|Si2O7], Ferriallanite-(Ce) {CaCe}{Fe3+AlFe2+}[O|OH|SiO4|Si2O7], Manganiandrosite-(Ce) (Mn2+,Ca)(Ce,REE)Mn3+AlMn2+(Si2O7)(SiO4)O(OH), Manganiandrosite-(La) {LaMn2+}{Mn3+AlMn2+}[O|OH|SiO4|Si2O7], Vanadoandrosite-(Ce) {Mn2+Ce}{V3+AlMn2+}[O|OH|SiO4|Si2O7]
      • Dollaseite group

Class: Tectosilicates

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Class: Tectosilicates without Zeolitic H2O

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Class: Tectosilicates with Zeolitic H2O

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  • Category:Zeolite group
  • Alflarsenite NaCa2Be3Si4O13(OH)•2H2O
  • Zeolites with T5O10 Units – The Fibrous Zeolites
  • Chains of single connected 4-membered rings: Ammonioleucite (NH4,K)AlSi2O6, Leucite KAlSi2O6, Analcime NaAlSi2O6•H2O, Hsianghualite Ca3Li2Be3(SiO4)3F2, Lithosite K6Al4Si8O25•H2O, Pollucite (Cs,Na)2Al2Si4O12•H2O, Wairakite CaAl2Si4O12•2H2O, Laumontite CaAl2Si4O12•4H2O, Yugawaralite CaAl2Si6O16•4H2O, Roggianite Ca2[Be(OH)2Al2Si4O13]•2.5H2O, Goosecreekite CaAl2Si6O16•5H2O, Montesommaite (K,Na)9Al9Si23O64•10H2O, Partheite Ca2Al4Si4O15(OH)2•4H2O
  • Chains of doubly-connected 4-membered rings: Amicite K2Na2Al4Si4O16•5H2O, Garronite Na2Ca5Al12Si20O64•27H2O, Gobbinsite (Na2,Ca)2K2Al6Si10O32•12H2O, Gismondine Ca2Al4Si4O16•9H2O, Harmotome (Ba,Na,K)(1-2)(Si,Al)8O16•6H2O, Phillipsite-Na (Na,K,Ca)(1-2)(Si,Al)8O16•6H2O, Phillipsite-Ca (Ca,K,Na)(1-2)(Si,Al)8O16•6H2O, Phillipsite-K (K,Na,Ca)(1-2)(Si,Al)8O16•6H2O, Merlinoite (K,Ca,Na,Ba)7Si23Al9O64•23H2O, Mazzite-Mg K2CaMg2(Al,Si)36O72•28H2O, Mazzite-Na Na8Al8Si28O72•30H2O, Perlialite K8Tl4Al12Si24O72•20H2O, Boggsite NaCa2(Al5Si19O48)•17H2O, Paulingite-Ca (Ca,K,Na,Ba)5[Al10Si35O84]•34H2O, Paulingite-K (K2,Ca,Na2,Ba)5Al10Si35O90•45H2O, Paulingite-Na (Na2,K2,Ca,Ba)5Al10Si35O90•45H2O
  • Chains of 6-membered rings – tabular zeolites: Gmelinite-Ca (Ca,Na2)Al2Si4O12•6H2O, Gmelinite-K (K,Na,Ca)6(Al7Si17O48)•22H2O, Gmelinite-Na (Na2,Ca)Al2Si4O12•6H2O, Chabazite-K (K2,Ca,Na2,Mg)[Al2Si4O12]•6H2O, Chabazite-Ca (Ca0.5,Na,K)4[Al4Si8O24]•12H2O, Chabazite-Na (Na2,K2,Ca,Mg)[Al2Si4O12]•6H2O, Chabazite-Sr (Sr,Ca,K2,Na2)[Al2Si4O12]•6H2O, Herschelite? (Na,Ca,K)AlSi2O6•3H2O, Willhendersonite KCaAl3Si3O12•5H2O, Levyne-Ca (Ca,Na2,K2)Al2Si4O12•6H2O, Levyne-Na (Na2,Ca,K2)Al2Si4O12•6H2O, Bellbergite (K,Ba,Sr)2Sr2Ca2(Ca,Na)4Al18Si18O72•30H2O, Erionite-Ca (Ca,K2,Na2)2[Al4Si14O36]•15H2O, Erionite-K (K2,Ca,Na2)2[Al4Si14O36]•15H2O, Erionite-Na (Na2,K2,Ca)2[Al4Si14O36]•15H2O, Wenkite Ba4Ca6(Si,Al)20O39(OH)2(SO4)3•nH2O (?), Offretite (K2,Ca,Mg)2.5Al5Si13O36•15H2O, Faujasite-Ca (Ca,Na2,Mg)3.5[Al7Si17O48]•32H2O, Faujasite-Mg (Mg,Na2,Ca)3.5[Al7Si17O48]•32H2O, Faujasite-Na (Na2,Ca,Mg)3.5[Al7Si17O48]•32H2O, Maricopaite Pb7Ca2(Si,Al)48O100•32H2O, Mordenite (Ca,Na2,K2)Al2Si10O24•7H2O, Dachiardite-Ca (Ca,Na2,K2)5Al10Si38O96•25H2O, Dachiardite-Na (Na2,Ca,K2)4Al4Si20O48•13H2O, Epistilbite CaAl2Si6O16•5H2O, Ferrierite-K (K,Na)2Mg(Si,Al)18O36•9H2O, Ferrierite-Mg (Mg,Na,K)2Mg(Si,Al)18O36•9H2O, Ferrierite-Na (Na,K)2Mg(Si,Al)18O36•9H2O, Bikitaite Li2[Al2Si4O12]•2H2O
  • Chains of T10O20 Tetrahedra: Clinoptilolite-Na (Na,K,Ca)(2-3)Al3(Al,Si)2Si13O36•12H2O, Clinoptilolite-K (Na,K,Ca)(2-3)Al3(Al,Si)2Si13O36•12H2O, Clinoptilolite-Ca (Ca,Na,K)(2-3)Al3(Al,Si)2Si13O36•12H2O, Heulandite-Ba (Ba,Ca,K,Na,Sr)5Al9Si27O72•22H2O, Heulandite-Ca (Ca,Na)(2-3)Al3(Al,Si)2Si13O36•12H2O, Heulandite-K (K,Na,Ca)(2-3)Al3(Al,Si)2Si13O36•12H2O, Heulandite-Na (Na,Ca)(2-3)Al3(Al,Si)2Si13O36•12H2O, Heulandite-Sr (Sr,Na,Ca)(2-3)Al3(Al,Si)2Si13O36•12H2O, Stilbite-Ca NaCa4[Al8Si28O72]•nH2O (n=28-32), Stilbite-Na Na3Ca3[Al8Si28O72]•nH2O (n=28-32), Barrerite (Na,K,Ca)2Al2Si7O18•6H2O, Stellerite CaAl2Si7O18•7H2O, Brewsterite-Ba (Ba,Sr)Al2Si6O16•5H2O, Brewsterite-Sr (Sr,Ba)Al4Si12O32•10H2O
  • Other Rare Zeolites: Terranovaite (Na,Ca)8(Si68Al12)O160•29H2O, Gottardiite Na3Mg3Ca5Al19Si117O272•93H2O, Lovdarite K2Na6Be4Si14O36•9H2O, Gaultite Na4Zn2Si7O18•5H2O, Chiavennite CaMnBe2Si5O13(OH)2•2H2O, Tschernichite (Ca,Na)(Si6Al2)O16•(4-8)H2O, Mutinaite Na3Ca4Si85Al11O192•60H2O, Tschortnerite Ca4(Ca,Sr,K,Ba)3Cu3(OH)8[Si12Al12O48]•xH2O, x>=20, Thornasite Na12Th3[Si8O19]4•18H2O, Direnzoite NaK6MgCa2(Al13Si47O120)•36H2O
  • Unclassified zeolites: Cowlesite CaAl2Si3O10•(5-6)H2O, Mountainite (Ca,Na2,K2)2Si4O10•3H2O

Class: Germanates

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Groupings (non Silicates)

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The German Umlaut (diacritic) is written as the vowel plus an "e".

  • Groups/ Mostly grouping that is used in mindat.org and New Dana Classification
    • Category 01 (Metals and intermetallic alloys; metalloids and nonmetals; carbides, silicides, nitrides, phosphides)
      • Class 01: Native Elements
        • Gold group (Copper group) Silver Amalgam group Platinum-Group Elements (Iridium, Osmium, Palladium, Platinum, Rhodium, Ruthenium) Arsenic group
    • Category 02 - Sulfides and Sulfosalts (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
      • Class 02: Sulfides - Including Selenides and Tellurides
        • Chalcocite-Digenite group Pentalndite group Galena group Sphalerite group Wurtzite group Nickeline group Chalcopyrite group Stannite group Linnaeite group (or Thiospinel) Tetradymite group Pyrite group Marcasite group Cobaltite group Arsenopyrite group Molybdenite group Skutterudite group
      • Class 03: Sulfosalts
        • Colusite group Cylindrite group Hauchecornite group Tetrahedrite group Proustite group Aikinite group (Lillianite group) Matildite group Sartorite group (Pavonite group)
    • Category 03
      • Class: Halides
        • 09 - (Halite group) Fluorite group Matlockite group
        • 10 - Atacamite group (Paratacamite group)
        • 11 - (none)
        • 12 - (Chukhrovite group)
    • Category 04 - Oxides (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
      • 04 - Simple oxides
        • Periclase group Corundum-Hematite group Perovskite group Ilmenite group Rutile group
      • Class 06: Hydroxide minerals and Oxides containing hydroxyl groups
        • Diaspore group Brucite group (Wickmanite group)
      • Class: Uranyl Hydroxides; V[5+,6+] Vanadates; Arsenites, Antimonites, Bismuthites, Sulfites; Iodates
        • 05 - Uranium and Thorium (none)
        • 07 - Spinel group (Aluminum subgroup Iron subgroup Chromium subgroup Vanadium subgroup Titanium subgroup Taaffeite group Others) Humite group Cryptomelane group Hoegbomite group Nigerite group
        • 08 - Pyrochlore group (Pyrochlore subgroup Microlite subgroup Betafite subgroup Cesstibtantite subgroup) Tapiolite group Crichtonite group
    • Category 05 - Carbonates (Nitrates)
      • 13 - (none)
      • 14 - Calcite group Aragonite group Dolomite group (Burbankite group)
      • 15 - (none)
      • 16a - Rosasite group (Malachite group)
      • 16b - Ancylite group Sjorgrenite-Hydrotalcite group (Manasseite n Hydrotalcite subgroup)
      • 17 - Tundrite group
      • Class: Nitrates
        • 18 - (none)
        • 19 - (none)
        • 20 - (none)
      • 21 - (none)
      • 22 - (none)
      • 23 - (none)
    • Category 06 - Borates
      • 24 - Ludwigite group
      • 25 - Boracite group
      • 26 - (Inyoite group) (Santite group) Hilgardite group (Pringleite group)
      • 27 - (none)
    • Category 07 - Sulfates (selenates, tellurates, chromates, molybdates, wolframates)
      • 28 - Barite group
      • 29 - (Blodite group) Alum group Voltaite group
        • Supergroup: Hydrated Acid and Sulfates where A XO4 · x(H2O)
          • Kieserite group Rozenite group (Chalchanthite group) Hexahydrite group Melanterite group Epsomite group (Minasragrite group)
        • Supergroup: Hydrated Acid and Sulfates where A (B)2 (XO4)4 · x(H2O)
          • Halotrichite group
      • 30 - Alunite group
      • 31 - Aluminite Zippeite group Copiapite group
      • 32 - (none)
      • Class: Selenates and Tellurates - Selenites - Tellurites - Sulfites - Chromates
      • Class: Uranyl Sulfates, Chromates, Molybdates, Wolframates and Niobates, Uranium and Uranyl Molybdates and Wolframates, Thiosulfates
        • 33 - (Pb, Zn tellurates)
        • 34 - (none)
        • 35 - (none)
        • 36 - (none)
    • Category 08 - Phosphates, Arsenates, Vanadates
      • 43 - Beudantite group
      • 44 - (Stibiconite group)
      • 45 - (none)
      • 46 - (none)
      • 47 - Rossite group (Pascoite group) (Hewettite group) (Straczekite group)
      • 48 - Wolframite series Scheelite series
      • 49 - (none)
      • Class: Anydrous phosphates
        • 37 - (none)
        • 38 - Triphylite group Alluaudite-Wyllieite group Fillowite group Whitlockite group Monazite group (Zenotime group)
        • 41 - Retzian series Adelite group Descloizite group Tilasite group Amblygonite group Wagnerite group Olivenite group Arrojadite group Apatite group Svabite group Pyromorphite group Rockbridgeite group Lazulite group Preisingerite group
      • Class: Hydrated phosphates
        • 39 - Hureaulite group Lindackerite group
        • 40 - Struvite group Fairfieldite subgroup Roselite subgroup Brackebushite group (Helmutwinklerite subgroup) Autunite group Vivianite group Variscite group Metavariscite group Rhabdophane group Walpurgite group
        • 42 - Mixite group Crandallite group Roscherite group Pharmacosiderite group Turquoise group Overite group Jahnsite group Whiteite group Leucophosphite group Montgomeryite group Strunzite group Laueite group Whitmoreite group
      • Class: Antimonates - Antimonites, Arsenites and Phosphites - Vanadium Oxysalts - Molybdates and Tungstates
      • Class: Polyphosphates, Polyarsenates, [4]-Polyvanadates
    • Category 10
      • Class 50: Salts of Organic Acids and Hydrocarbons (none)

Groupings (Silicates)

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  • Groupings
    • Category 09 - Silicates (Germanates)
      • Class: Nesosilicates
        • 51 - Garnet group Zircon group Olivine group Phenakite group
        • 52 - Humite group Al2SiO5 group Chloritoid group Titanite group Cerite group (Silicate apatites)
        • 53 - Uranophane group
        • 54 - Datolite group Hellandite group Vicanite group
      • Class: Sorosilicates
        • 55 - Thortveitite group Melilite group
        • 56 - Axinite group Cuspidine-Wohlerite group Murmanite group Perierite-Chevkinite group
        • 57 - (none)
        • 58 - Epidote group Pumpellyite group Vesuvianite group
      • Class: Cyclosilicates
        • 59 - Benitoite group Umbite group Catapleiite group
        • 60 - Joaquinite group Labuntsovite group
        • 61 - (Beryl group) Lovozerite group Steenstrupine group
          • Alkali-Deficient Tourmaline subgroup - Foitite subgroup
          • Calcic Tourmaline subgroup - Buergerite subgroup
          • Lithian Tourmaline subgroup - Elbaite subgroup
          • Sodic Tourmaline subgroup - Schorl subgroup
        • 62 - (none)
        • 63 - Steacyite group Milarite-Osumilite group
        • 64 - Eudialyte group
      • Class: Inosilicates - Pyroxene group
        • Clinopyroxene subgroup Orthopyroxene subgroup
      • Class: Inosilicates - Amphibole group
        • Mg-Fe-Mn-Li subgroup Calcic subgroup Mg-Fe-Mn-Li Sodic-calcic subgroup Sodic subgroup Na-Ca-Mg-Fe-Mn-Li subgroup
        • 65 - Carpholite group Wollastonite group Haradaite group Batisite group
        • 66 - Amphiboles Tahualite group
        • 67 - (none)
        • 68 - (none)
        • 69 - Astrophyllite group (Aenigmatite)
        • 70 - Neptunite group
      • Class: Phyllosilicates
        • 71 - Chlorite group (Tri-Dioctahedral)
        • Phyllosilicates Phyllosilicate Sheets of Six-Membered Rings with 1:1 layers
          • Kaolinite-Serpentine group
        • Phyllosilicates Phyllosilicate Sheets of Six-Membered Rings with 2:1 Layers
          • Pyrophyllite-talc group Mica group
        • Phyllosilicates Phyllosilicate Sheets of Six-Membered Rings with 2:1 clays
          • Smectite group
        • 72 - Dalylite group Tobermorite group Pyrosmalite group
        • 73 - (none)
        • 74 - Ganophyllite group
      • Class: Tectosilicates without Zeolitic H2O
        • 75 - (none) Quartz varities
        • 76 - Feldspar group Feldspathoid group (Sodalite group Cancrinite group)
      • Class: Tectosilicates with Zeolitic H2O
        • 77 - Zeolite group
      • Class: Unclassified silicates
        • 78 - (none)
      • Class: Germanates

References

[edit]
  • "New Dana Classification". webmineral.com.
  • "Nickel-Strunz (Version 10) Classification System". webmineral.com.
  • "Mineral groups". mindat.org.