Corundum Al2 O3
Alumina , Hematite (group) Sapphire, Eu doped , Sapphire , Ruby
Open
An image of corundum (rubies and sapphires), specimen M 898 (Museums Victoria), from Victoria, Australia
©
Photograph by Frank Coffa, Museums Victoria, CC-BY
17
2
CL/SEM, SXES
Mineral, Simple oxide
Cotunnite PbCl2
—
—
1
0
IR
Mineral, Halide
Creedite Ca3 Al2 (SO4 )(OH)2 F8 ·2H2 O
Minerals containing OH , Minerals containing SO4 , Minerals containing H2O —
Open
Creedite specimen from Akchatau, Shet District, Karaganda, Kazakhstan
©
Photo by Chip Clark, via Smithsonian National Museum of Natural History
5
0
PL, PL/XL
Hydroxide , Mineral, Sulphate , Hydrated , Halide
Cristobalite SiO2
Silica —
Open
Cristobalite on obsidian from Canyon Butte, Siskiyou County, California, USA
©
Rob Lavinsky, iRocks.com – CC-BY-SA-3.0
4
0
CL, CL/OM, PL/XL, Unknown
Mineral, Simple oxide
Crocoite PbCrO4
Minerals containing Cr[VI]O4 —
Open
Crocoite specimen from Red Lead mine, Zeehan, Tasmania, Australia
©
Unknown photographer, courtesy Smithsonian National Museum of Natural History
1
0
PL
Mineral
Cryolite Na3 AlF6
—
—
Open
Cryolite specimen from the Ivigtut Cryolite deposit, Ivittuut, Arsuk Firth, Arsuk, Kitaa Province, Greenland. Size: 8.8 x 6.7 x 5 cm
©
Photo by Didier Descouens (via Wikimedia Commons), CC-BY-SA-3.0
5
0
IR, PL
Mineral, Halide
Cryolithionite Na3 Al2 (LiF4 )3
—
—
Open
White massive cryolithionite from Ivigtut, Ivittuut, Arsuk Fjord, Sermersooq, Greenland.
©
Photo by David Hospital (via Wikimedia Commons), CC-BY-SA 4.0
1
0
PL/XL
Mineral, Halide
Cummingtonite ☐Mg2 Mg5 Si8 O22 (OH)2 , ☐{Mg,FeII }2 {Mg,FeII }5 Si8 O22 (OH)2
Minerals containing OH , Mg-Fe-Mn amphibole , Cummingtonite-Grunerite (series) —
Open
Brownish-colored sprays of cummingtonite needles, from near West Chesterfield, western Hampshire County, western Massachusetts, USA
©
(C) 2017 James St. John (via Wikimedia Commons). CC-BY-2.0
2
0
Reflectance
Hydroxide , Mineral, Silicate
Cummingtonite-Grunerite (series) ◻{Mg2 }{Mg5 }(Si8 O22 )(OH)2 — ◻{FeII 2 }{FeII 5 }(Si8 O22 )(OH)2
Mg-Fe-Mn amphibole Grunerite , Cummingtonite , Cummingtonite, Fe2+
4
0
Reflectance
Hydroxide , Silicate , Series
Curite Pb3 (H2 O)2 [(UO2 )4 O4 (OH)3 ]2
Minerals containing OH , Minerals containing H2O —
Open
Curite from Katanga, DR Congo, exhibited at the Mineralogical Museum, Bonn, Germany
©
Photo by Elke Wetzig, CC-BY-SA
4
0
PL
Hydroxide , Mineral, Uranyl , Hydrated
Cyclosilicate [Sin 3n ]2n -
—
—
1
0
Reflectance
Group
Danburite CaB2 Si2 O8
—
—
Open
Danburite specimen from Madagascar
©
Photo by Ken Larsen, via Smithsonian National Museum of Natural History
13
3
PL/Laser, Reflectance
Mineral, Borosilicate
Dark mica —
Mica —
3
0
Reflectance
Aluminosilicate , Informal
Datolite CaB(SiO4 )(OH)
Minerals containing OH , Datolite (subgroup) , Minerals containing SiO4 —
Open
Datolite specimen from Prospect Park, Passaic Co., New Jersey, USA
©
Photo by Svea Lin Rodgers, via Smithsonian National Museum of Natural History
11
3
PL/Laser, Reflectance
Hydroxide , Mineral, Borosilicate
Delhayelite K7 Na3 Ca5 Al2 Si14 O38 F4 Cl2
—
—
Open
Outstanding grey crystals of the rare mineral delhayelite from Rasvumtchorr, Khibiny, Kola, Russian Federation
©
Photo by David Hospital (on wikimedia.org), CC-BY-SA 4.0
9
0
PL, PL/XL
Mineral, Hydrated , Aluminosilicate
