| Larderellite | NH4B5O6(OH)4 |
| Launayite | Pb22Sb26S61 |
| Laurionite | PbClOH |
| Laurite | (Ru,S) |
| Lawrencite | (Fe,Cl) |
| Lazulite | MgAl2(PO4)2(OH)2 |
| Leadamalgam | HgPb2 |
| Leadhillite | Pb4SO4(CO3)2(OH)2 |
| Lechatelierite | SiO2 |
| Lepidocrocite | FeO(OH) |
| Linnaeite | Co3S4 |
| Lollingite | FeAs2 |
| Lorettoite | (Pb,Cl,O) |
| Lorimar | NaCa2Si3O8(OH) |
| Luanheite | Ag3Hg |