| Junitoite | CaZn2Si2O7 · H2O |
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| Jusite | Na2Ca15Al4Si16O54 · 17H2O |
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| 'Justite (of Hofmann-Degen)' | (Ca,Fe,Zn,Mg)3Si2O7 |
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| Kaersutite | NaCa2(Mg3AlTi4+)(Si6Al2)O22O2 |
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| 'Kaersutite Root Name Group' | ACa2(Z32+Z3+Ti)(Si6Al2O22)O2 |
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| Kainosite-(Y) | Ca2(Y,Ce)2(Si4O12)(CO3) · H2O |
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| Kalyuzhnyite-(Ce) | NaKCaSrCeTi(Si8O21)OF(H2O)3 |
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| Kamaishilite | Ca2(Al2SiO6)(OH)2 |
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| Kannanite | Ca4Al4(AlMg)(VO4)(SiO4)2(Si3O10)(OH)6 |
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| Kapitsaite-(Y) | (Ba,K,Pb)4(Y,Ca)2Si8(B,Si)4O28F |
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| Karupmøllerite-Ca | (Na,Ca,K)2Ca(Nb,Ti)4(Si4O12)2(O,OH)4 · 7H2O |
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| Kasatkinite | Ba2Ca8B5Si8O32(OH)3 · 6H2O |
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| Katayamalite | KLi3Ca7Ti2(SiO3)12(OH)2 |
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| Katophorite | {Na}{CaNa}{Mg4Al}[(AlSi7)O22](OH)2 |
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| 'Katophorite Root Name Group' | A(CaNa)(Z42+Z3+)(AlSi7O22)(OH,F,Cl)2 |
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| 'Keatingine' | CaMn2+(Si2O6) |
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| 'Keilhauite' | (Ca,Y3+)(Ti,Al,Fe3+)[SiO4]O |
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| 'Kembleite' | Ca4Al6Si6O24CO3 |
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| Kenotobermorite | Ca4Si6O15(OH)2(H2O)2 · 3H2O |
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| Kentbrooksite | (Na,REE)15(Ca,REE)6(Mn2+,Fe2+)3Zr3Nb[Si25O74]F2 · 2H2O |
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| Kerimasite | Ca3Zr2(SiO4)(Fe3+O4)2 |
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| Kesebolite-(Ce) | CeCa2Mn(AsO4)(SiO3)3 |
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| Khesinite | Ca4(Mg3Fe93+)O4(Fe93+Si3)O36 |
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| Khomyakovite | Na12Sr3Ca6Fe3Zr3W[Si25O73](O,OH,H2O)3(OH,Cl)2 |
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| Khristovite-(Ce) | (CaCe)(MgAlMn2+)F[Si2O7][SiO4](OH) |
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| Khurayyimite | Ca7Zn4(Si2O7)2(OH)10 · 4H2O |
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| Khvorovite | (Pb,Ba,K)4Ca2[Si8B2(Si,B)2O28]F |
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| Kilchoanite | Ca6(SiO4)(Si3O10) |
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| Killalaite | Ca6.4(H0.6Si2O7)2(OH)2 |
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| Kimzeyite | Ca3Zr2(SiO4)(AlO4)2 |
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| Kinoite | Ca2Cu2(H2O)2[Si3O10] |
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| Kircherite | Na5Ca2K(Al6Si6O24)(SO4)2 · 0.33H2O |
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| Kirschsteinite | CaFe2+SiO4 |
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| Kittatinnyite | Ca2Mn2Mn(SiO4)2(OH)4 · 9H2O |
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| Koashvite | Na6(Ca,Mn)(Ti,Fe)Si6O18 · H2O |
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| Kochite | Na3Ca2MnZrTi(Si2O7)2OF3 |
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| Kodamaite | Na3(Ca5Na)Si16O36(OH)4F2 · (14-x)H2O |
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| Kolskyite | CaNa2Ti4(Si2O7)2O4(H2O)7 |
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| Komarovite | (Ca,Mn)(Nb,Ti)2[Si2O7](O,F)3 · 3.5H2O |
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| Kottenheimite | Ca 3Si(SO4)2(OH)6 · 12H2O |
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| 'Kovalenkoite' | (K,Sr,Ba)2Ca5Nb12[Si8O52(O,OH)] · 15H2O |
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| Kozłowskiite | Ca4Fe22+Sn3(Si2O7)2(Si2O6OH)2 |
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| Krásnoite | Ca3Al7.7Si3P4O23.5(OH)12.1F2 · 8H2O |
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| Kristiansenite | Ca4Sc2Sn2(Si2O7)2(Si2O6OH)2 |
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| Kumtyubeite | Ca5(SiO4)2F2 |
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| Kuratite | Ca2(Fe52+Ti)O2[Si4Al2O18] |
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| Kushiroite | CaAl[AlSiO6] |
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| 'Kutyukhinite' | 2Ca2(SiO4) · CaF2 |
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| Kvanefjeldite | Na4(Ca,Mn)(Si3O7)2(OH)2 |
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| 'Labradorite' | (Ca,Na)[Al(Al,Si)Si2O8] |
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