Creedite
Ca3 Al2 (SO4 )(OH)2 F8 ·2H2 O
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—
Open
Creedite specimen from Akchatau, Shet District, Karaganda, Kazakhstan
©
Photo by Chip Clark, via Smithsonian National Museum of Natural History
4
0
—
Hydrated , Mineral, Hydroxide , Halide , Sulphate
Cristobalite
SiO2
Silica
—
Open
Cristobalite on obsidian from Canyon Butte, Siskiyou County, California, USA
©
Rob Lavinsky, iRocks.com – CC-BY-SA-3.0
3
0
—
Mineral, Simple oxide
Crocoite
PbCrO4
—
—
Open
Crocoite specimen from Red Lead mine, Zeehan, Tasmania, Australia
©
Unknown photographer, courtesy Smithsonian National Museum of Natural History
1
0
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Mineral
Cronstedtite
(FeII ,FeIII )3 (Si,FeIII )2 O5 (OH)4
Serpentine (subgroup)
—
0
0
—
Mineral, Hydroxide , Silicate
Cryolite
Na3 AlF6
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—
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
—
Mineral, Halide
Cryolithionite
Na3 Al2 (LiF4 )3
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—
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
—
Mineral, Halide
Cummingtonite
☐Mg2 Mg5 Si8 O22 (OH)2
Cummingtonite-Grunerite (series) , Mg-Fe-Mn amphibole
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2
0
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Mineral, Hydroxide , Silicate
Cummingtonite-Grunerite (series)
◻{Mg2 }{Mg5 }(Si8 O22 )(OH)2 — ◻{FeII 2 }{FeII 5 }(Si8 O22 )(OH)2
Mg-Fe-Mn amphibole
Grunerite , Cummingtonite
4
0
—
Hydroxide , Silicate , Series
Cuprospinel
CuII FeIII 2 O4
Spinel (subgroup)
—
0
0
—
Mineral
Curite
Pb3 (H2 O)2 [(UO2 )4 O4 (OH)3 ]2
—
—
Open
Curite from Katanga, DR Congo, exhibited at the Mineralogical Museum, Bonn, Germany
©
Photo by Elke Wetzig, CC-BY-SA
4
0
—
Uranyl , Mineral, Hydroxide , Hydrated
Cyclosilicate
[Sin O3n ]2n -
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—
4
0
—
Group
Cyrtolite
Zr[(SiO4 ),(OH)4 ]
Zircon
—
0
0
—
Silicate , Hydroxide, Variety