Lonsdaleite
C
Carbon
—
1
0
3
CL, SXES
Mineral
Lorenzenite
Na2 Ti2 O3 (Si2 O6 )
—
—
Open
Pale pink crystals of lorenzenite, from Poudrette quarry, Mont Saint-Hilaire, Rouville RCM, Montérégie, Québec, Canada
Photo by Modris Baum (on wikimedia.org), Public Domain
0
3
0
PL
Mineral, Silicate
Lorándite
TlAsS2
—
—
Open
Lorándite crystals (red) on orpiment (orange), from Allchar, Rožden, Republic of Northern Macedonia
Rob Lavinsky, iRocks.com – CC-BY-SA-3.0
0
2
0
PL
Mineral, Sulphide
Lutetium fluoride
LuF3
REE fluoride
—
1
7
2
CL/SEM
REE, Halide , Synthetic , Compound
Lutetium oxide
Lu2 O3
REE oxide
—
0
1
0
PL
REE, Simple oxide , Synthetic , Compound
Lutetium oxyhydroxide
LuOOH
—
—
0
1
0
IR
REE, Hydroxide , Compound
Lutetium ultraphosphate
LuP5 O14
—
—
1
7
2
CL/SEM, SXES
REE, Phosphate , Synthetic , Compound , Ultraphosphate
Löllingite
FeAs2
—
—
2
0
0
—
Mineral, Arsenide
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