Mineral Index
| J | ||
| Jadeite |  Mineral Data
| Images |
| Jimthompsonite | Mineral Data
| Images |
| K | ||
| Kaersutite | Mineral Data
| Images |
| Kanonaite | see under Viridine | |
| Khristovite | see under Allanite | |
| Kornerupine | Mineral Data
| Images |
| Kutnahorite | Mineral Data
| Images |
| Kyanite | Mineral Data
| Images |
| L | ||
| Larnite | Mineral Data
| Images |
| Laumontite | Mineral Data
| Images |
| Lawsonite | Mineral Data
| Images |
| Lazurite | see under Sodalite Group | |
| Lepidolite - Zinnwaldite | Mineral Data
| Images |
| Leucite | Mineral Data
| Images |
| Levyne | Mineral Data
| Images |