Mineral Index
| M | ||
| Magnesite |  Mineral Data
| Images |
| Margarite | Mineral Data
| Images |
| Marialite | see under Scapolite | |
| Meionite | see under Scapolite | |
| Melanite | see under Garnet | |
| Melilite (Gehlenite - Åkermanite) | Mineral Data
| Images |
| Merwinite | Mineral Data
| Images |
| Mesolite | Mineral Data
| Images |
| Microcline | Mineral Data
| Images |
| Minnesotaite | Mineral Data
| Images |
| Monazite | Mineral Data
| Images |
| Monticellite | Mineral Data
| Images |
| Mordenite | Mineral Data
| Images |
| Mullite | Mineral Data
| Images |
| Muscovite - Phengite | Mineral Data
| Images |
| N | ||
| Natrolite | Mineral Data
| Images |
| Nepheline | Mineral Data
| Images |
| Norbergite | Mineral Data
| Images |
| Nosean | see under Sodalite Group | |
| O | ||
| Olivine | Mineral Data
| Images |
| Omphacite | Mineral Data
| Images |
| Opal | Mineral Data
| Images |
| Orthoclase | Mineral Data
| Images |
| Orthopyroxene | see under Enstatite | |
| Osumilite | Mineral Data
| Images |
| Oxyhornblende | see under Hornblende | |