- M
-
- Macrocrystalline
- Mafic
- Magma
- Magmatic
- Magmatite
- Magmatite rock
- Magnesia
- Magnet
- Magnetic
- Magnetic field
- Magnetism
- Malleable
- Mammilary
- Mantle
- Massive
- Matrix
- Melting point
- Mesothermal vein
- Metal
- Metallic
- Metallic (luster)
- Metallic elements
(subgroup)
- Metallurgy
- Metamict
- Metamiction
- Metamorphic
- Metamorphic rock
- Metamorphism
- Metasilicate chains
- Metasilicate rings
- Metasilicates
- Metasomatically
- Metasomatism
- Metastability
- Metastable
- Meteor
- Meteoroid
- Meteoric
- Meteorite
- Mica
- Mica group
- Micaceous
- Microcrystalline
- Micromount
- Mine (noun)
- Mine (verb)
- Miner
- Mineral
- Mineral group
- Mineral series
- Mineral show
- Mineraloid
- Mineralogy
- Mineralogist
- Mining
- Mixed crystal
- Mohs hardness scale
- Molecule
- Molecular
- Molecular arrangement
- Molecular structure
- Mollusk
- Molten
- Molten rock
- Molybdates (group)
- Monochromatic
- Monoclinic (crystal
system)
- Monotropic
- Mother-of-pearl
- Mother-of-pearl (luster)
- Mother rock
- Mottled
- Multicolored
- Multiple oxides (subgroup)
- Mylonite