M
- Mandarinoite: Fe2(SeO3)3·4H2O and telluromandarinoite – American-Canadian mineralogist Joseph A. Mandarino (1929-2007)
- Maricite: NaFePO4 – Yugoslavian mineralogist Luba Maric (1899-1979), University of Zagreb
- Mckelveyite-(Y): Ba3NaCa0.75U0.25Y(CO3)6•3(H2O) – American geologist Vincent E. McKelvey (1916–1985)
- Mendeleevite-(Ce): Cs6(Ce22Ca6)(Si70O175)(OH,F)14(H2O)21 – Russian chemist Dmitri Ivanovich Mendeleev (1834-1907)
- Millerite: NiS – British mineralogist William Hallowes Miller (1801–1880)
- Moissanite SiC (naturally occurring) – discoverer Henri Moissan (1852–1907)
- Morganite: – American financier J. P. Morgan (1837–1913)
- Murdochite: PbCu6O8-x(Cl,Br)2x – American mineralogist Joseph Murdoch (1890–1973)
Read more about this topic: List Of Minerals Named After People