Maghemite
(FeIII 0.67 ☐0.33 )FeIII 2 O4
Iron oxide/hydroxide , Spinel (subgroup)
—
1
0
0
—
Mineral
Magnesio-hornblende
☐Ca2 (Mg4 Al)(Si7 Al)O22 (OH)2 , ☐Ca2 {(Mg,FeII )4 Al}(Si7 Al)O22 (OH)2
Minerals containing OH , Hornblende root name group
—
2
0
0
—
Hydroxide , Mineral, Aluminosilicate
Magnesite
MgCO3
Minerals containing CO3 , Calcite (group)
—
Open
Magnesite specimen from Serra das Éguas, Brumado, Bahia, Brazil
Photo by Didier Descouens (on wikimedia.org), CC-BY-SA 4.0
6
9
2
CL/SEM
Carbonate , Mineral
Magnesium hydroxide
Mg(OH)2
—
—
0
3
0
IR, Raman
Hydroxide , Compound
Magnesium oxide
MgO
—
Periclase
Open
Periclase specimen from Stassfurt, Saxony, Germany
Photo courtesy Smithsonian National Museum of Natural History
1
4
0
IR
Simple oxide , Compound
Magnetite
FeII FeIII 2 O4
Iron(II,III) oxide , Spinel (subgroup)
Titanomagnetite
Open
Magnetite specimen from Cerro Huañaquino, Potosí Department, Bolivia
Rob Lavinsky, iRocks.com – CC-BY-SA-3.0
15
2
0
CL/OM
Mineral, Mixed oxide
Magnioursilite
Mg4 (UO2 )4 (Si2 O5 )5 (OH)6 ·20H2 O
Minerals containing OH , Ursilite , Minerals containing H2O
—
0
5
0
PL
Hydroxide , Mineral, Silicate , Uranyl , Hydrated
Majorite
Mg3 (MgSi)(SiO4 )3
Minerals containing SiO4 , Garnet
—
1
0
0
—
Mineral, Silicate
Malachite
Cu2 (CO3 )(OH)2
Minerals containing OH , Minerals containing CO3
—
Open
Malachite specimen from the Katanga Copper Crescent, Democratic Republic of Congo
Photo by Didier Descouens (via Wikimedia Commons), CC-BY-SA 3.0
12
0
0
—
Carbonate , Hydroxide , Mineral, Hydrated
Malayaite
CaSnO(SiO4 )
Minerals containing SiO4 , Titanite (group)
—
Open
Yellow crystals of malayaite from Red-a-Ven Mine, Okehampton, Devon, United Kingdom
Photo by David Hospital (on wikimedia.org), CC-BY-SA 4.0
0
1
0
PL
Mineral, Silicate
Malladrite
Na2 SiF6
—
—
0
7
0
IR
Mineral, Halide
Manganese
Mn
—
—
Open
Two pieces of manganese metal
(C) 2005 W. Oelen (via Wikimedia Commons). CC-BY-SA-3.0
1
10
2
SXES
Metal , Element
Manganese oxyhydroxide
MnOOH
—
—
0
5
0
IR
Hydroxide , Compound
Marcasite
FeS2
—
—
Open
Marcasite (FeS2) from Zeche Friedrich Der Grasse Herne, North Rhine-Westphalia, Germany
Photo by Svea Lin Rodgers, Smithsonian Institution, CC0
3
6
0
IR
Mineral, Sulphide
Marialite
Na4 Al3 Si9 O24 Cl
Scapolite (group)
—
1
0
0
—
Mineral, Aluminosilicate