| kaatialaite | FeAs3O9·6-8H2O |
| kadyrelite | Hg4(Br,Cl)2O |
| kaersutite | NaCa2Mg4TiSi6Al2O23OH |
| kafehydrocyanite | K4Fe(CN)6·3H2O |
| kahlerite | Fe(UO2)2(AsO4)2·10-12H2O |
| kainite | MgSO4·KCl·3H2O |
| kainosite-(Y) | Ca2(Y,Ce)2Si4O12CO3·H2O |
| kalborsite | K6Al4Si6BO20(OH)4Cl |
| kaliborite | KHMg2B12O16(OH)10·4H2O |
| kalicinite | KHCO3 |
| kalifersite | (K,Na)5Fe7Si20O50(OH)6·12H2O |
| kalininite | ZnCr2S4 |
| kalinite | KAl(SO4)2·11H2O |
| kaliophilite | KAlSiO4 |
| kalipyrochlore | (K,Sr)2-XNb2O6(O,OH)·nH2O |
| kalistrontite | K2Sr(SO4)2 |
| kalsilite | KAlSiO4 |
| kaluginite | (Mn,Ca)MgFe(PO4)2OH·4H2O |
| kamacite | (Fe,Ni) |
| kamaishilite | Ca2Al2SiO6(OH)2 |
| kambaldaite | NaNi4(CO3)3(OH)3·3H2O |
| kamchatkite | KCu3(SO4)2OCl |
| kamiokite | Fe2Mo3O8 |
| kamitugaite | PbAl(UO2)5[(P,As)O4]2(OH)9·9.5H2O |
| kammererite | clinochlore |
| kamotoite-(Y) | Y2U4(CO3)3O12·14.5H2O |
| kamphaugite-(Y) | Ca(Y,REE)(CO3)2OH·H2O |
| kanemite | NaSi2O4OH·3H2O |
| kankite | FeAsO4·3.5H2O |
| kanoite | (Mn,Mg)2Si2O6 |
| kanonaite | (Mn,Al)AlSiO5 |
| kaolinite | Al2Si2O5(OH)4 |
| kaolinite-serpentine group | |
| karasugite | SrCaAl(F,OH)7 |
| karelianite | V2O3 |
| karibibite | Fe2As4(O,OH)9 |
| karlite | (Mg,Al)6(BO3)3(OH,Cl)4 |
| karnasurtite-(Ce) | (Ce,La,Th)(Ti,Nb)(Al,Fe)(Si,P)2O7(OH)4·3H2O |
| karpatite | C24H12 |
| karpinskite | (Mg,Ni)2Si2O5(OH)2 |
| kashinite | (Ir,Rh)2S3 |
| kasolite | Pb(UO2)SiO4·H2O |
| kassite | CaTi2O4(OH)2 |
| katangite | plancheite |
| katayamalite | baratovite |
| katoite | Ca3Al2(SiO4)3-X(OH)4X, x=1.5-3 |
| katophorite | Na2CaFe4(Al,Fe)Si7AlO22(OH)2 |
| katoptrite | (Mn,Mg)13(Al,Fe)4Sb2Si2O28 |
| kawazulite | Bi2(Te,Se,S)3 |
| kazakhstanite | Fe5V3V12O39(OH)9·9H2O |
| kazakovite | Na6(Mn,H2)TiSi6O18 |
| keckite | Ca(Mn,Zn)2Fe3(PO4)4(OH)3·2H2O |
| kegelite | Pb8Al4Si8(SO4)2(CO3)4O20(OH)8 |
| keilhauite | titanite |
| keithconnite | Pd3-xTe |
| keiviite-(Y) | (Y,Yb)2Si2O7 |
| keiviite-(Yb) | (Yb,Y)2Si2O7 |
| keldyshite | Na2-XHXZrSi2O7·nH2O |
| kellyite | (Mn,Mg,Al)3(Si,Al)2O5(OH)4 |
| kelyanite | Hg36Sb3(Cl,Br)9O28 |
| kemmlitzite | (Sr,Ce)Al3AsO4SO4(OH)6 |
| kempite | Mn2Cl(OH)3 |
| kentbrooksite | Na15(Ca,REE)6Mn3Zr3NbSi25O76F2 |
| kenhsuite | Hg3S2Cl2 |
| kentrolite | Pb2Mn2Si2O9 |
| kenyaite | Na2Si22O41(OH)8·6H2O |
| kenyite | plagioclase |
| kermesite | Sb2S2O |
| kernite | Na2B4O6(OH)2·3H2O |
| kerstenite | a lead selenite |
| kerolite | talc |
| kerphalite | andalusite |
| kesterite | Cu2(Zn,Fe)SnS4 |
| kettnerite | CaBiCO3OF |
| keyite | Cu3(Zn,Cu)4Cd2(AsO4)6·2H2O |
| keystoneite | Mg0.5NiFe(TeO3)3·4.5H2O |
| khademite | AlSO4F·5H2O |
| khaidarkanite | Cu4Al3(OH)14F3·2H2O |
| khamrabaevite | (Ti,V,Fe)C |
| khanneshite | (Na,Ca)3(Ba,Sr,Ce,Ca)3(CO3)5 |
| kharaelakhite | (Pt,Cu,Pb,Fe,Ni)9S8 |
| khatyrkite | (Cu,Zn)Al2 |
| khibinskite | K2ZrSi2O7 |
| khinite | PbCu3TeO4(OH)6 |
| khristovite-(Ce) | (Ca,Ce)(Ce,REE)(Mg,Fe)AlMnSi3O11(OH,F,O)2 |
| kiddcreekite | Cu6SnWS8 |
| kidwellite | NaFe9(PO4)6(OH)10·5H2O |
| kieftite | CoSb3 |
| kieserite | MgSO4·H2O |
| kieserite group | |
| kilchoanite | Ca3Si2O7 |
| killalaite | 2Ca3Si2O7·H2O |
| kimrobinsonite | (Ta,Nb)(OH)3(O,CO3) |
| kimuraite-(Y) | CaY2(CO3)4·6H2O |
| kimzeyite | Ca3(Zr,Ti)2(Si,Al,Fe)3O12 |
| kingite | Al3(PO4)2(OH,F)3·9H2O |
| kingsmountite | (Ca,Mn)4(Fe,Mn)Al4(PO4)6(OH)4·12H2O |
| kinichilite | MgMn2Fe2(TeO3)6·9H2O |
| kinoite | Ca2Cu2Si3O8(OH)4 |
| kinoshitalite | BaMg3Al2Si2O10(OH)2 |
| kintoreite | PbFe3(PO4)2(OH,H2O)6 |
| kipushite | (Cu,Zn)5Zn(PO4)2(OH)6·H2O |
| kirkiite | Pb10Bi3As3S19 |
| kirovite | melanterite |
| kirschsteinite | CaFeSiO4 |
| kitkaite | NiTeSe |
| kittatinnyite | Ca4Mn2Mn4Si4O16(OH)8·18H2O |
| kivuite | H2(Th,Ca,Pb)(UO2)4(PO4)2(OH)8·7H2O |
| kjerulfine | wagnerite |
| kladnoite | C6H4(CO)2NH |
| klebelsbergite | Sb4O4(OH)2SO4 |
| kleberite | pseudorutile |
| kleemanite | ZnAl2(PO4)2(OH)2·3H2O |
| kleinite | Hg2N(Cl,SO4)·nH2O |
| klockmannite | CuSe |
| klyuchevskite | K3Cu3(Fe,Al)(SO4)4O2 |
| knebelite | fayalite |
| knopite | loparite-(Ce) |
| knorringite | Mg3Cr2(SiO4)3 |
| koashvite | Na6(Ca,Mn)(Ti,Fe)Si6O18·H2O |
| kobeite-(Y) | (Y,U)(Ti,Nb)2(O,OH)6 |
| kobellite | Pb22Cu4(Bi,Sb)30S69 |
| kochkarite | PbBi4Te7 |
| koechlinite | Bi2MoO6 |
| koenenite | Na4Mg9Al4Cl12(OH)22 |
| kogarkoite | Na3SO4F |
| koktaite | (NH4)2Ca(SO4)2·H2O |
| kolarite | PbTeCl2 |
| kolbeckite | ScPO4·2H2O |
| kolfanite | Ca2Fe3(AsO4)3O2·2H2O |
| kolicite | Mn7Zn4(AsO4)2(SiO4)2(OH)8 |
| kolovratite | hydrated nickel zinc vanadate |
| kolwezite | (Cu,Co)2CO3(OH)2 |
| kolymite | Cu7Hg6 |
| komarovite | (H,Ca)2Nb2Si2O10(OH,F)2·H2O |
| kombatite | Pb14(VO4)2O9Cl4 |
| komkovite | BaZrSi3O9·3H2O |
| konderite | PbCu3(Rh,Pt,Ir)8S16 |
| koninckite | FePO4·3H2O |
| konyaite | Na2Mg(SO4)2·5H2O |
| koragoite | (Mn,Fe)3(Nb,Mn)2(Nb,Ta,Ti)3(W,Ta)2O20 |
| koritnigite | ZnAsO3OH·H2O |
| kornelite | Fe2(SO4)3·7H2O |
| kornerupine | Mg4(Al,Fe)6(Si,B)4O21OH |
| kornite | (Na,K)Na2Mg2Mn2LiSi8O22(OH)2 |
| korobitsynite | NaTi2Si4O12OH2·4H2O |
| korshunovskite | Mg2Cl(OH)3·3.5-4H2O |
| korzhinskite | CaB2O4·H2O |
| kosmochlor | NaCrSi2O6 |
| kosnarite | KZr2(PO4)3 |
| kossmatite | vermiculite |
| kostovite | CuAuTe4 |
| kostylevite | K2ZrSi3O9·H2O |
| kotoite | Mg3B2O6 |
| kottigite | Zn3(AsO4)2·8H2O |
| kotulskite | Pd(Te,Bi) |
| koutekite | Cu5As2 |
| kovdorskite | Mg5(PO4)2CO3(OH)2·4.5H2O |
| kozulite | NaNa2Mn4(Fe,Al)Si8O22(OH)2 |
| kraisslite | (Mn,Mg)24Zn3Fe(AsO3)2(AsO4)3(SiO4)6(OH)18 |
| krasnovite | Ba(Al,Mg)(PO4,CO3)(OH)2·H2O |
| kratochvilite | C13H10 |
| krausite | KFe(SO4)2·H2O |
| krauskopfite | BaSi2O4(OH)2·2H2O |
| krautite | MnAsO3OH·H2O |
| kremersite | (NH4,K)2FeCl5·H2O |
| krennerite | (Au,Ag)Te2 |
| kribergite | Al5(PO4)3SO4(OH)4·4H2O |
| krinovite | Na2Mg4Cr2Si6O20 |
| kroehnkite | Na2Cu(SO4)2·2H2O |
| krupkaite | PbCuBi3S6 |
| krutaite | CuSe2 |
| krutovite | NiAs2 |
| kryzhanovskite | MnFe2(PO4)2(OH)2·H2O |
| ktenasite | (Cu,Zn)5(SO4)2(OH)6·6H2O |
| kukharenkoite-(Ce) | Ba2(Ce,La)(CO3)3F |
| kukisvumite | Na6ZnTi4Si8O28·4H2O |
| kuksite | Pb3Zn3TeO6(PO4)3 |
| kulanite | Ba(Fe,Mn,Mg)2Al2(PO4)3(OH)3 |
| kuliokite-(Y) | (Y,Yb)4Al(SiO4)2(OH)2F5 |
| kulkeite | Na0.35Mg8AlAlSi7O20(OH)10 |
| kullerudite | NiSe2 |
| kunzite | spodumene |
| kupletskite | (K,Na)3(Mn,Fe)7(Ti,Nb)2Si8O24(O,OH)7 |
| kuramite | Cu3SnS4 |
| kuranakhite | PbMnTeO6 |
| kurchatovite | Ca(Mg,Mn,Fe)B2O5 |
| kurnakovite | MgB3O3(OH)5·5H2O |
| kurumsakite | (Zn,Ni,Cu)8Al8V2Si5O35·27H2O |
| kusachiite | CuBi2O4 |
| kutinaite | Cu14Ag6As7 |
| kutnohorite | Ca(Mn,Mg,Fe)(CO3)2 |
| kuzelite | Ca4Al2SO4(OH)12·6H2O |
| kuzminite | Hg2(Br,Cl)2 |
| kuznetsovite | Hg2HgClAsO4 |
| kvanefjeldite | Na4(Ca,Mn)Si6O14(OH)2 |
| kyanite | Al2SiO5 |
| kyzylkumite | V2Ti3O9 |