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
9
2
CL/SEM
Carbonate , Mineral
Magnesium hydroxide Mg(OH)2
—
—
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
4
0
IR
Simple oxide , Compound
Magnetite FeII FeIII 2 O4
Spinel (subgroup) , Iron(II,III) oxide Titanomagnetite
Open
Magnetite specimen from Cerro Huañaquino, Potosí Department, Bolivia
©
Rob Lavinsky, iRocks.com – CC-BY-SA-3.0
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 —
5
0
PL
Hydroxide , Mineral, Silicate , Uranyl , Hydrated
Malayaite CaSnO(SiO4 )
Titanite (group) , Minerals containing SiO4 —
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
1
0
PL
Mineral, Silicate
Malladrite Na2 SiF6
—
—
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
10
2
SXES
Metal , Element
Manganese oxyhydroxide MnOOH
—
—
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
6
0
IR
Mineral, Sulphide
Masuyite Pb(UO2 )3 O3 (OH)2 ·3H2 O
Minerals containing OH , Minerals containing H2O —
Open
Masuyite (red spherical aggregates) and becquerelite (yellow) with fourmarierite (dark red/umber), on uraninite matrix, from Shinkolobwe, Katanga, Democratic Republic of Congo
©
Rob Lavinsky, iRocks.com – CC-BY-SA-3.0
4
0
PL
Hydroxide , Mineral, Uranyl , Hydrated
Meionite Ca4 Al6 Si6 O24 (CO3 )
Scapolite (group) , Minerals containing CO3 —
Open
Meionite (scapolite) crystals in a quartz matrix, from Bolton Lime Quarries, Bolton, Worcester Co., MA, USA
©
Rob Lavinsky, iRocks.com – CC-BY-SA-3.0
9
2
Reflectance
Mineral, Aluminosilicate , Carbonate
Meliphanite Ca4 (Na,Ca)4 Be4 AlSi7 O24 (F,O)4
—
—
Open
Meliphanite specimen from Langesundsfjorden, Larvik, Vestfold, Norway
©
Rob Lavinsky, iRocks.com – CC-BY-SA-3.0
22
0
IL, PL, PL/XL
Mineral, Aluminosilicate
Mercury sulphide HgS
—
Cinnabar , Hypercinnabar
Open
©
2009 JJ Harrison (https://www.jjharrison.com.au/), CC-BY-SA-3.0
0
1
SXES
Sulphide , Compound
Merwinite Ca3 Mg(SiO4 )2
Minerals containing SiO4 —
1
0
PL
Mineral, Silicate
