| Laachite | (Ca,Mn)₂Zr₂Nb₂TiFeO₁₄ | Monoclinic | — | — |
| Labuntsovite-Fe | Na₄K₄Fe²⁺₂Ti₈O₄(Si₄O₁₂)₄(OH)₄·10-12H₂O | — | — | — |
| Labuntsovite-Mg | Na₄K₄Mg₂Ti₈O₄(Si₄O₁₂)₄(OH)₄·10-12H₂O | — | — | — |
| Labuntsovite-Mn | Na₄K₄Mn²⁺₂Ti₈O₄(Si₄O₁₂)₄(OH)₄·10-12H₂O | — | — | — |
| Labyrinthite | (Na,K,Sr)₃₅Ca₁₂Fe₃Zr₆TiSi₅₁O₁₄₄(O,OH,H₂O)₉Cl₃ | Trigonal | — | — |
| Lacroixite | NaAl(PO₄)F | Monoclinic | — | — |
| Laffittite | AgHgAsS₃ | Monoclinic | — | 5.84 g/cm³ |
| Laflammeite | Pd₃Pb₂S₂ | Monoclinic | — | — |
| Laforêtite | — | Tetragonal | — | 4.93 g/cm³ |
| Lafossaite | Tl(Cl,Br) | Cubic | — | — |
| Lagalyite | Ca₂xMn₁-xO₂*₁.₅-₂H₂O | Monoclinic | — | — |
| Lahnsteinite | Zn₄(SO₄)(OH)₆·3H₂O | Triclinic | — | — |
| Laihunite | Fe²⁺Fe³⁺₂(SiO₄)₂ | Monoclinic | 6.0 | — |
| Laitakarite | Bi₄Se₃ | Trigonal | — | — |
| Lakargiite | CaZrO₃ | Orthorhombic | — | 4.60 g/cm³ |
| Lakebogaite | NaCaFe₂H(UO₂)₂(PO₄)₄(OH)₂·8H₂O | — | — | — |
| Lalondeite | (Na,Ca)₆(Ca,Na)₃Si₁₆O₃₈(F,OH)₂*₃H₂O | — | — | — |
| Lammerite | Cu₃(AsO₄)₂ | Monoclinic | — | 5.25 g/cm³ |
| Lamprophyllite | (SrNa)Ti₂Na₃Ti(Si₂O₇)₂O₂(OH)₂ | Monoclinic | — | — |
| Lanarkite | Pb₂O(SO₄) | Monoclinic | — | 6.98 g/cm³ |
| Landauite | NaMnZn₂(Ti,Fe)₆Ti₁₂O₃₈ | — | — | — |
| Landesite | Mn²⁺₃-xFe³⁺x(PO₄)₂(OH)x * (₃-x)H₂O | — | — | — |
| Langbeinite | K₂Mg₂(SO₄)₃ | Cubic | — | 2.84 g/cm³ |
| Langhofite | — | Triclinic | — | — |
| Langisite | (Co,Ni)As | Hexagonal | — | — |
| Langite | Cu₄SO₄(OH)₆·2H₂O | Monoclinic | — | — |
| Lanmuchangite | Tl+Al(SO₄)₂ * 12H₂O | — | — | — |
| Lannonite | Mg₂Ca₄Al₄(SO₄)₈F₈·24H₂O | Tetragonal | — | — |
| Lansfordite | MgCO₃·5H₂O | Monoclinic | — | — |
| Lanthanite-(Ce) | Ce₂(CO₃)₃(H₂O)₆·2H₂O | Orthorhombic | — | — |
| Lanthanite-(La) | La₂(CO₃)₃(H₂O)₆·2H₂O | Orthorhombic | — | — |
| Lanthanite-(Nd) | Nd₂(CO₃)₃(H₂O)₆·2H₂O | Orthorhombic | — | — |
| Lapeyreite | Cu₃O[AsO₃(OH)]₂·H₂O | Monoclinic | — | — |
| Laphamite | As₂(Se,S)₃ | Monoclinic | 1.5 | — |
| Lapieite | CuNiSbS₃ | Orthorhombic | — | 4.96 g/cm³ |
| Laplandite-(Ce) | Na₄CeTiPO₄Si₇O₁₈ * 5H₂O | — | — | — |
| Laptevite-(Ce) | NaFe²⁺(REE₇Ca₅Y₃)(SiO₄)₄(Si₃B₂PO₁₈)(BO₃)F₁₁ | Trigonal | — | — |
| Larderellite | NH₄B₅O₇(OH)₂·H₂O | Monoclinic | — | — |
| Larisaite | Na(H₃O)(UO₂)₃(SeO₃)O₂ * 4H₂O | — | 1.0 | — |
| Larnite | Ca₂SiO₄ | Monoclinic | 6.0 | 2.96 g/cm³ |
| Larosite | (Cu,Ag)₂₁PbBiS₁₃ | — | — | — |
| Larsenite | PbZnSiO₄ | Orthorhombic | — | 5.83 g/cm³ |
| Lasalite | Na₂Mg₂V₁₀O₂₈·20H₂O | Monoclinic | 1.0 | — |
| Lasmanisite | Ag₁₂Pb₁₃Mn₁₁Sb₄₄S₉₆ | Orthorhombic | — | — |
| Lasnierite | (Ca,Sr)(Mg,Fe²⁺)₂Al(P[O,F]₄)₃ | Orthorhombic | — | — |
| Latiumite | (Ca,K)₄(Si,Al)₅O₁₁(SO₄,CO₃) | — | — | — |
| Latrappite | Ca₂NbFe³⁺O₆ | — | — | — |
| Laueite | Mn²⁺Fe³⁺₂(PO₄)₂(OH)₂ * 8H₂O | Triclinic | 3.0 | — |
| Laumontite | CaAl₂Si₄O₁₂·4H₂O | Monoclinic | — | — |
| Launayite | CuPb₁₀(Sb,As)₁₂S₂₀ | Monoclinic | — | — |
| Lauraniite | — | Monoclinic | — | — |
| Laurelite | Pb₇F₁₂Cl₂ | Hexagonal | — | — |
| Laurentianite | [NbO(H₂O)]₃(Si₂O₇)₂[Na(H₂O)₂]₃ | Trigonal | — | — |
| Laurentthomasite | — | Hexagonal | 6.0 | — |
| Laurionite | PbCl(OH) | Orthorhombic | — | — |
| Laurite | RuS₂ | Cubic | — | 6.15 g/cm³ |
| Lausenite | Fe₂(SO₄)₃*₅H₂O | Monoclinic | — | — |
| Lautarite | Ca(IO₃)₂ | Monoclinic | — | 4.60 g/cm³ |
| Lautenthalite | PbCu₄(SO₄)₂(OH)₆ * 3H₂O | Monoclinic | — | — |
| Lautite | CuAsS | Orthorhombic | — | 4.90 g/cm³ |
| Lavendulan | NaCaCu₅(AsO₄)₄Cl·5H₂O | Monoclinic | 2.8 | 3.54 g/cm³ |
| Laverovite | K₂NaMn₇Zr₂(Si₄O₁₂)₂O₂(OH)₄F | Triclinic | — | — |
| Lavinskyite | K(LiCu)Cu₆(Si₄O₁₁)₂(OH)₄ | Orthorhombic | 5.0 | — |
| Lavoisierite | Mn²⁺₈[Al₁₀(Mn³⁺Mg)][Si₁₁P]O₄₄(OH)₁₂ | Orthorhombic | — | — |
| Lavrentievite | Hg²⁺₃S₂(Cl,Br)₂ | Monoclinic | — | — |
| Lawrencite | FeCl₂ | Trigonal | — | 3.17 g/cm³ |
| Lawsonbauerite | (Mn²⁺,Mg)₉Zn₄(SO₄)₂(OH)₂₂ * 8H₂O | Monoclinic | — | — |
| Lawsonite | CaAl₂Si₂O₇(OH)₂·H₂O | Orthorhombic | 7.5 | — |
| Lazaraskeite | Cu(C₂H₃O₃)₂ | Monoclinic | — | — |
| Lazarenkoite | (Ca,Fe²⁺)Fe³⁺As³⁺₃O₇ * 3H₂O | Orthorhombic | — | — |
| Lazaridisite | Cd₃(SO₄)₃·8H₂O | Monoclinic | — | — |
| Lazerckerite | Ag₃.₇₅Pb₄.₅₀(Sb₇.₇₅Bi₄)S₂₄ | Monoclinic | — | — |
| Lazulite | MgAl₂(PO₄)₂(OH)₂ | Monoclinic | — | — |
| Lazurite | Na[(AlSiO4)SO4] | Cubic | 5.5 | — |
| Lead | Pb | Cubic | — | — |
| Leadamalgam | Pb₀.₇Hg₀.₃ | Tetragonal | — | — |
| Leadhillite | Pb₄(SO₄)(CO₃)₂(OH)₂ | Monoclinic | — | — |
| Lebedevite | K₄Na₁₄Cu₁₄O₈(AsO₄)₈Cl₆ | Tetragonal | — | — |
| Lechatelierite | SiO₂ | Amorphous | 5.5 | 2.12 g/cm³ |
| Lechnerite | Ag₁₀Cu₄HgPb₃₃Sb₅₈S₁₂₈ | Triclinic | — | — |
| Lecontite | (NH₄,K)NaSO₄ * 2H₂O | Orthorhombic | — | — |
| Lecoqite-(Y) | Na₃Y(CO₃)₃·6H₂O | Hexagonal | — | — |
| Lednevite | Cu[PO₃(OH)]·H₂O | Monoclinic | — | — |
| Leesite | K(H₂O)₂[(UO₂)₄O₂(OH)₅]*₃H₂O | Orthorhombic | — | — |
| Lefontite | Fe₂Al₂Be(PO₄)₂(OH)₆ | Orthorhombic | — | — |
| Legrandite | Zn₂AsO₄(OH)·H₂O | Monoclinic | — | — |
| Leguernite | Bi₁₂.₆₇O₁₄(SO₄)₅ | Monoclinic | — | — |
| Lehmannite | — | Monoclinic | — | — |
| Lehnerite | Mn²⁺(UO₂)₂(PO₄)₂ * 8H₂O | — | — | — |
| Leifite | Na₇Be₂(Si₁₅Al₃)O₃₉(F,OH)₂ | Trigonal | — | — |
| Leightonite | K₂Ca₂Cu(SO₄)₄·2H₂O | — | — | — |
| Leishmanite | Ba(H₂O)₄[(UO₂)₃O₂(OH)₃]₂·3H₂O | Orthorhombic | — | — |
| Leisingite | [Mg(H₂O)₆]Cu₂MgTe⁶⁺O₆ | Trigonal | — | — |
| Leiteite | ZnAs³⁺₂O₄ | Monoclinic | — | — |
| Lemanskiite | NaCaCu₅(AsO₄)₄Cl * 3H₂O | Tetragonal | — | — |
| Lemmleinite-Ba | Na₄K₄Ba₂₊ₓTi₈(Si₄O₁₂)₄(OH,O)₈·8H₂O | — | — | — |
| Lemmleinite-K | Na₄K₈Ti₈(Si₄O₁₂)₄(OH,O)₈·8H₂O | — | — | — |
| Lemoynite | (Na,K)₂CaZr₂Si₁₀O₂₆ * 5H₂O | Monoclinic | — | — |
| Lenaite | AgFeS₂ | Tetragonal | — | — |
| Lengenbachite | Ag₄Cu₂Pb₁₈As₁₂S₃₉ | — | — | — |
| Leningradite | PbCu₃(VO₄)₂Cl₂ | Orthorhombic | — | — |
| Lennilenapeite | K₆-₇(Mg,Mn,Fe,Zn)₄₈(Si,Al)₇₂(O,OH)₂₁₆ * 16H₂O | — | — | — |
| Lenoblite | — | Orthorhombic | — | — |
| Leogangite | Cu₁₀(AsO₄)₄(SO₄)(OH)₆ * 8H₂O | Monoclinic | — | — |
| Leonardsenite | MgAlF₅·2H₂O | Orthorhombic | — | — |
| Leonite | K₂Mg(SO₄)₂·4H₂O | — | 2.8 | 2.20 g/cm³ |
| Lepageite | Mn²⁺₃(Fe³⁺₇Fe²⁺₄)O₃[Sb³⁺₅As³⁺₈O₃₄] | Triclinic | — | — |
| Lepersonnite-(Gd) | CaGd₂(UO₂)₂₄(CO₃)₈Si₄O₂₈·60H₂O | Orthorhombic | — | — |
| Lepidocrocite | Fe³⁺O(OH) | Orthorhombic | 5.0 | — |
| Lepkhenelmite-Zn | Ba₂Zn(Ti,Nb)₄(Si₄O₁₂)₂(O,OH)₄·7H₂O | — | — | — |
| Lermontovite | U(PO₄)(OH) * H₂O | — | — | — |
| Lesukite | — | — | — | — |
| Letnikovite-(Ce) | (Na◻)Ca₂Ce₂[Si₇O₁₇(OH)]F₄(H₂O)₄ | Monoclinic | — | — |
| Letovicite | (NH₄)₃H(SO₄)₂ | Triclinic | — | — |
| Leucite | K(AlSi₂O₆) | Tetragonal | — | — |
| Leucophanite | NaCaBeSi₂O₆F | Orthorhombic | — | 2.97 g/cm³ |
| Leucophoenicite | Mn²⁺₇(SiO₄)₃(OH)₂ | Monoclinic | — | — |
| Leucophosphite | KFe³⁺₂(PO₄)₂(OH)(H₂O)₂ | — | 3.5 | — |
| Leucosphenite | BaNa₄Ti₂B₂Si₁₀O₃₀ | Monoclinic | — | — |
| Leucostaurite | Pb₂[B₅O₉]Cl·0.5H₂O | Orthorhombic | — | — |
| Levantite | KCa₃Al₂(SiO₄)(Si₂O₇)(PO₄) | Monoclinic | — | — |
| Leverettite | Cu₃CoCl₂(OH)₆ | Trigonal | — | — |
| Levinsonite-(Y) | YAl(SO₄)₂(C₂O₄)·12H₂O | Monoclinic | — | 2.18 g/cm³ |
| Leybovite-K | KCuNa(MgFe³⁺)(AsO₄)₃ | Monoclinic | — | — |
| Leydetite | Fe(UO₂)(SO₄)₂·11H₂O | Monoclinic | — | — |
| Leószilárdite | — | Monoclinic | — | — |
| Lianbinite | (NH₄)(C₂H₃O₃)(C₂H₄O₃) | Monoclinic | — | — |
| Liandratite | U(Nb,Ta)₂O₈ | Trigonal | 3.5 | — |
| Liangjunite | K₂(Mo₂O₅)(SO₄)₂·3H₂O | — | — | — |
| Libbyite | (NH₄)₂(Na₂◻)[(UO₂)₂(SO₄)₃(H₂O)]₂·7H₂O | — | — | — |
| Liberite | Li₂BeSiO₄ | Monoclinic | 7.0 | 2.74 g/cm³ |
| Libethenite | Cu₂PO₄(OH) | Orthorhombic | 4.0 | — |
| Liebauite | Ca₃Cu₅Si₉O₂₆ | Monoclinic | — | — |
| Liebenbergite | Ni₂SiO₄ | Orthorhombic | — | 4.95 g/cm³ |
| Liebermannite | KAlSi₃O₈ | Tetragonal | — | 2.46 g/cm³ |
| Liebigite | Ca₂(UO₂)(CO₃)₃·11H₂O | Orthorhombic | — | 2.41 g/cm³ |
| Liguowuite | WO₃ | Monoclinic | — | — |
| Likasite | Cu₃(NO₃)(OH)₅ * 2H₂O | Orthorhombic | — | — |
| Lileyite | Ba₂Ti₂Na₂Fe²⁺Mg(Si₂O₇)₂O₂F₂ | Monoclinic | — | — |
| Lillianite | Pb₃₋₂ₓAgₓBi₂₊ₓS₆ | — | — | — |
| Lime (mineral) | CaO | Cubic | — | 3.35 g/cm³ |
| Limousinite | — | Monoclinic | — | — |
| Linarite | PbCuSO₄(OH)₂ | Monoclinic | 2.5 | — |
| Lindackerite | Cu₅(AsO₄)₂(AsO₃OH)₂·9H₂O | — | — | — |
| Lindbergite | MnC₂O₄·2H₂O | Monoclinic | 2.5 | 2.10 g/cm³ |
| Lindgrenite | Cu₃(MoO₄)₂(OH)₂ | Monoclinic | 4.5 | — |
| Lindqvistite | — | — | — | — |
| Lindsleyite | — | — | — | — |
| Lindströmite | Pb₃Cu₃Bi₇S₁₅ | Orthorhombic | — | — |
| Lingbaoite | AgTe₃ | Trigonal | — | — |
| Lingunite | NaAlSi₃O₈ | Tetragonal | — | 2.64 g/cm³ |
| Linnaeite | Co₃S₄ | Cubic | — | 4.77 g/cm³ |
| Lintisite | LiNa₃Ti₂(Si₂O₆)₂O₂ * 2H₂O | — | — | — |
| Linzhiite | FeSi₂ | Tetragonal | — | 5.08 g/cm³ |
| Liottite | (Na,K)₁₆Ca₈(Al₆Si₆O₂₄)₃(SO₄)₅Cl₄ | Hexagonal | — | — |
| Lipscombite | Fe²⁺Fe³⁺₂(PO₄)₂(OH)₂ | — | — | — |
| Lipuite | KNa₈Mn³⁺₅Mg₀.₅[Si₁₂O₃₀(OH)₄](PO₄)O₂(OH)₂·4H₂O | Orthorhombic | — | — |
| Liraite | — | Orthorhombic | — | — |
| Liroconite | Cu₂AlAsO₄(OH)₄·4H₂O | Monoclinic | — | — |
| Lisanite | — | Triclinic | — | — |
| Lisetite | CaNa₂Al₄Si₄O₁₆ | — | — | — |
| Lishiite | (Ca₂◻)Sr₃(CO₃)₅ | Hexagonal | — | — |
| Lishizhenite | ZnFe₂(SO₄)₄ * 14H₂O | Triclinic | — | — |
| Lisiguangite | CuPtBiS₃ | Orthorhombic | 2.5 | 7.74 g/cm³ |
| Lisitsynite | KBSi₂O₆ | Orthorhombic | — | 2.63 g/cm³ |
| Liskeardite | [(Al,Fe)₃₂(AsO₄)₁₈(OH)₄₂(H₂O)₂₂] * 5₂H₂O | Monoclinic | — | — |
| Lislkirchnerite | Pb₆Al(OH)₈Cl₂(NO₃)₅*₂H₂O | Monoclinic | — | — |
| Litharge | PbO | Tetragonal | — | 8.81 g/cm³ |
| Lithiomarsturite | LiCa₂Mn₃Si₅O₁₄(OH) | — | — | — |
| Lithiophilite | LiMn²⁺(PO₄) | Orthorhombic | — | — |
| Lithiophorite | (Al,Li)Mn⁴⁺O₂(OH)₂ | — | — | — |
| Lithiophosphate | Li₃PO₄ | Orthorhombic | — | — |
| Lithiotantite | LiTa₃O₈ | — | — | — |
| Lithiowodginite | — | — | — | — |
| Lithosite | K₃Al₂Si₄O₁₂(OH) | Monoclinic | — | — |
| Litidionite | KNaCuSi₄O₁₀ | Triclinic | — | — |
| Litochlebite | Ag₂PbBi₄Se₈ | Monoclinic | — | — |
| Litvinskite | Na₂(☐,Na,Mn)ZrSi₆O₁₂(OH,O)₆ | Monoclinic | — | — |
| Liudongshengite | — | Trigonal | — | — |
| Liuite | FeTiO₃ | Orthorhombic | — | — |
| Liveingite | Pb₂₀As₂₄S₅₆ | — | — | — |
| Liversidgeite | Zn₆(PO₄)₄·7H₂O | Triclinic | — | — |
| Livingstonite | HgSb₄S₆(S₂) | Monoclinic | — | 4.79 g/cm³ |
| Lizardite | Mg₃Si₂O₅(OH)₄ | Monoclinic | 2.5 | 2.49 g/cm³ |
| Llantenesite | Cu₆Al[SeO₄](OH)₁₂Cl*₃H₂O | Trigonal | — | — |
| Lobanovite | K₂Na(Fe²⁺₄Mg₂Na)Ti₂(Si₄O₁₂)₂O₂(OH)₄ | — | — | — |
| Lokkaite-(Y) | CaY₄(CO₃)₇·9H₂O | Orthorhombic | — | — |
| Lombardoite | Ba₂Mn³⁺(AsO₄)₂(OH) | Monoclinic | — | — |
| Lomonosovite | Na₆Na₂Ti₂Na₂Ti₂(Si₂O₇)₂(PO₄)₂O₄ | Triclinic | — | — |
| Londonite | CsBe₅Al₄B₁₁O₂₈ | Cubic | — | — |
| Longshoushanite-(Ce) | Ce₄MgAl₂Ti₂(Si₂O₇)₂O₈ | Monoclinic | — | — |
| Lonsdaleite | C | Hexagonal | — | — |
| Loparite | (Na₀.₅REE₀.₅)TiO₃ | — | 5.8 | 4.76 g/cm³ |
| Lopatkaite | Pb₅Sb₃AsS₁₁ | Monoclinic | — | — |
| Loranskite-(Y) | (Y,Ce,Ca)(Zr,Ta)₂O₆ | — | — | — |
| Lorenzenite | Na₂Ti₂O₃(Si₂O₆) | Orthorhombic | 6.0 | 3.31 g/cm³ |
| Lorándite | TlAsS₂ | Monoclinic | — | 5.26 g/cm³ |
| Loseyite | (Mn²⁺,Zn,Mg)₄Zn₃(CO₃)₂(OH)₁₀ | Monoclinic | — | — |
| Lotharmeyerite | CaZn₂(AsO₄)₂·2H₂O | — | 3.0 | — |
| Loudounite | — | — | — | — |
| Loughlinite | Na₂Mg₃Si₆O₁₆ * 8H₂O | — | — | — |
| Lourenswalsite | (K,Ba)₂(Ti,Mg,Ca,Fe)₄(Si,Al,Fe)₆O₁₄(OH)₁₂ | Hexagonal | — | — |
| Lovdarite | K₂Na₆Be₄Si₁₄O₃₆·9H₂O | Orthorhombic | — | — |
| Loveringite | (Ca,Ce,La)(Zr,Fe)(Mg,Fe)₂(Ti,Fe,Cr,Al)₁₈O₃₈ | Hexagonal | 5.0 | 4.42 g/cm³ |
| Lovozerite | Na₃CaZrSi₆O₁₅(OH)₃ | — | — | — |
| Luanheite | Ag₃Hg | Hexagonal | 2.5 | 12.50 g/cm³ |
| Luanshiweiite | KLiAl₁.₅(Si₃.₅Al₀.₅)O₁₀(OH)₂ | Monoclinic | — | — |
| Luberoite | Pt₅Se₄ | Monoclinic | — | 12.67 g/cm³ |
| Luboržákite | Mn₂AsSbS₅ | Monoclinic | — | — |
| Lucabindiite | K(As₂O₃)₂Cl | Hexagonal | — | — |
| Lucasite-(Ce) | CeTi₂O₅(OH) | Monoclinic | — | — |
| Lucasite-(La) | LaTi₂O₅(OH) | Monoclinic | — | — |
| Lucchesiite | CaFe²⁺₃ Al₆(Si₆O₁₈)(BO₃)₃(OH)₃O | Trigonal | 7.0 | — |
| Ludjibaite | — | Triclinic | — | 4.36 g/cm³ |
| Ludlamite | Fe²⁺₃(PO₄)₂·4H₂O | Monoclinic | — | — |
| Ludlockite | PbFe³⁺₄As³⁺₁₀O₂₂ | Triclinic | — | — |
| Ludwigite | Mg₂Fe³⁺O₂(BO₃) | Orthorhombic | 5.5 | — |
| Lueshite | NaNbO₃ | — | — | 4.47 g/cm³ |
| Luetheite | CuAl(AsO₄)(OH)₂ | — | — | — |
| Luinaite-(OH) | (Na,☐)(Fe²⁺,Mg)₃Al₆(BO₃)₃Si₆O₁₈(OH)₄ | Monoclinic | — | — |
| Lukechangite-(Ce) | Na₃Ce₂(CO₃)₄F | Hexagonal | — | — |
| Lukkulaisvaaraite | Pd₁₄Ag₂Te₉ | Tetragonal | — | — |
| Lukrahnite | Ca(Cu,Zn)(Fe³⁺,Zn)(AsO₄)₂ * 2(H₂O,OH) | — | 5.0 | 4.18 g/cm³ |
| Lulzacite | Sr₂Fe²⁺(Fe²⁺,Mg)₂Al₄(PO₄)₄(OH)₁₀ | Triclinic | — | — |
| Lumsdenite | NaCa₃Mg₂(H₂O)₃₁(As³⁺V⁴⁺₂V⁵⁺₁₀As⁵⁺₆O₅₁)·14H₂O | Triclinic | — | — |
| Lun'okite | — | Orthorhombic | — | — |
| Lunijianlaite | Li₀.₇Al₆.₂(AlSi₇O₂₀)(OH,O)₁₀ | — | — | — |
| Luobusaite | Fe₀.₈₄Si₂ | Orthorhombic | — | — |
| Luogufengite | — | Orthorhombic | — | — |
| Luoxianchangite | Ag₈SnS₄Se₂ | Orthorhombic | — | — |
| Lusernaite-(Y) | Y₄Al(CO₃)₂(OH,F)₁₁·6H₂O | Orthorhombic | — | — |
| Lussierite | Na₁₀[(UO₂)(SO₄)₄](SO₄)₂(H₂O)₃ | Monoclinic | — | — |
| Luxembourgite | AgCuPbBi₄Se₈ | Monoclinic | 3.0 | — |
| Luzonite | Cu₃AsS₄ | Tetragonal | 3.5 | — |
| Lyonsite | — | Orthorhombic | — | — |
| Långbanite | — | — | 6.5 | — |
| Långbanshyttanite | Pb₂Mn₂Mg(AsO₄)₂(OH)₄·6H₂O | Triclinic | — | — |
| Låvenite | — | Monoclinic | — | — |
| Lévyne-Ca | Ca₃(Si₁₂Al₆)O₃₆·18H₂O | Trigonal | 4.0 | — |
| Lévyne-Na | Na₆(Si₁₂Al₆)O₃₆·18H₂O | Trigonal | — | — |
| Línekite | K₂Ca₃[(UO₂)(CO₃)₃]₂·7H₂O | Orthorhombic | — | — |
| Lópezite | K₂Cr₂O₇ | Triclinic | 2.5 | 2.77 g/cm³ |
| Löllingite | FeAs₂ | Orthorhombic | — | 7.60 g/cm³ |
| Löweite | Na₁₂Mg₇(SO₄)₁₃·15H₂O | Trigonal | — | — |
| Lüneburgite | Mg₃[B₂(OH)₆(PO₄)₂]·6H₂O | Triclinic | 2.0 | — |