a Minerals

Chalcosiderite from Wheal Phoenix, Liskeard, Cornwall, England (Type Locality for Chalcosiderite)

Chalcosiderite from West Phoenix Mine, Liskeard District, Cornwall, England

Chalcosiderite on Goethite from Wheal Phoenix, Stowes Section, Liskeard District, Cornwall, England (Type Locality for Chalcosiderite)

Chalcosiderite, Olivenite, Chalcophyllite from Wheal Phoenix, Linkinhorne, Cornwall, England (Type Locality for Chalcosiderite)

Chalcostibite from Sidi-Betache, Morocco

Chalcostibite with Azurite-Cuprorome´ite surface coating from Rar-el-Anz, Cherrat Wadi, Casablanca Prefecture, Morocco

Chalcothallite from Nakalaq, Ilímaussaq intrusive, Kvanefeld, Greenland (Type Locality for Chalcothallite)

Challacolloite (IMA 2004-028 ) and Uklonskovite from Lolon Mine (Challacollo Mine), Challacolla, Atacama, Chile (Type Locality for Challacolloite)

Chambersite from Barbers Hill, Chambers County, Texas (Type Locality for Chambersite)

Chambersite from Barbers Hill, Chambers County, Texas (Type Locality for Chambersite)

Chambersite from Venice Salt Dome, Plaquemines Parish, Louisiana

Chamosite on Datolite from Braen's Quarry, Haledon, Passaic County, New Jersey

Chamosite on Smoky Quartz from Millington Quarry, Bernards Township, Somerset County, New Jersey

Chamosite, Calcite, Chabazite from Millington Quarry, Bernards Township, Somerset County, New Jersey

Chapmanite from Keeley-Frontier Mine, South Lorrain Township, Timiskaming District, Ontario, Canada (Type Locality for Chapmanite)

Charoite from Murunskii Massif, between the Charo and Tokko Rivers, Aldan Shield, Yakutia, Russia (Type Locality for Charoite)

Charoite from Murunskii Massif, between the Charo and Tokko Rivers, Aldan Shield, Yakutia, Russia (Type Locality for Charoite)

Charoite from Murunskii Massif, between the Charo and Tokko Rivers, Aldan Shield, Yakutia, Russia (Type Locality for Charoite)

Charoite from Murunskii Massif, between the Charo and Tokko Rivers, Aldan Shield, Yakutia, Russia (Type Locality for Charoite)

Charoite from Murunskii Massif, between the Charo and Tokko Rivers, Aldan Shield, Yakutia, Russia (Type Locality for Charoite)

Charoite from Murunskii Massif, between the Charo and Tokko Rivers, Aldan Shield, Yakutia, Russia (Type Locality for Charoite)

Charoite and Fedorite from Murunskii Massif, between the Charo and Tokko Rivers, Aldan Shield, Yakutia, Russia (Type Locality for Charoite)

Charoite, Steacyite, Tinaksite, Aegirine from Murunskii Massif, between the Charo and Tokko Rivers, Aldan Shield, Yakutia, Russia (Type Locality for Charoite)

Chatham Emerald (synthetic Beryl var. Emerald) from California

Chatham Emerald cluster and faceted stone (Synthetic) from Man-made

Chenevixite pseudomorphs after Cuprite from Volcano-Sunnyside Mine, Harshaw District, Santa Cruz County, Arizona

Cheralite from Pilansberg Complex, Northwest Province, South Africa

Chervetite with Francevillite from Mouana Uranium Mine, Haut-Ogooue, Gabon (Type Locality for Chervetite and Francevillite)

Chessexite on Halite-Nitratine from Cala Cala, Pozo Almonte, Pampa del Tamarugal, Chile

Chiavennite from Tuften Quarry, Langangen, Langesundfjord, Telemark, Norway (Type Locality for Chiavennite)

Childrenite and Roscherite on Albite from Itatinga, Minas Gerais, Brazil

Chistyakovaite (IMA2005-003) from Bota-Burum Deposit, Alakol' Lake, Chu-Ili Mountains, Kazakhstan (Type Locality for Chistyakovaite)

Chlorapatite from Kurokura, Kanagawa, Japan

Chlorargyrite from Vekol Mine, Pinal County, Arizona

Chlorargyrite from S and O claims (Amethyst Hill), approximately 10 km northeast of Wickenburg, Yavapai County, Arizona

Chlorargyrite from Vekol Mine, Casa Grande, Pinal County, Arizona

Chlorargyrite (Bromian) from Broken Hill, New South Wales, Australia

Chlorargyrite (Bromian) from Broken Hill, New South Wales, Australia

Chlorargyrite (Cerargyrite var. Horn Silver) from Jefferson Canyon District, Jefferson, Nevada

Chlorargyrite on Iodargyrite from Broken Hill, New South Wales, Australia

Chlorargyrite var. Bromian from Proprietary Mine, Broken Hill, New South Wales, Australia

Chlorargyrite var. Cerargyrite from Chihuahua, Mexico

Chlorargyrite var. Cerargyrite (Horn Silver) from Ohio Mine, Gold Point, Nevada

Chlorargyrite var. Embolite from Broken Hill, New South Wales, Australia

Chlorargyrite var. Embolite from Broken Hill, New South Wales, Australia

Chlorargyrite var. Embolite from Broken Hill, New South Wales, Australia

Chlorargyrite var. Embolite from Broken Hill, New South Wales, Australia

Chlorargyrite var. Embolite on Limonite from Broken Hill, New South Wales, Australia

Chlorite on Titanite from Tormiq area, northwest of Skardu, Haramosh Mountains, Baltistan, Gilgit-Baltistan, Pakistan

Chlorite over Prehnite pseudomorphs after Anhydrite with Calcite from New Street Quarry, Paterson, Passaic County, New Jersey

Chlorite pseudomorph after Garnet from Vera Oldman Ranch, Encampment, Carbon County, Wyoming

Chlorite pseudomorph after Vesuvianite from Tahawus, Essex County, New York

Chlorite-Magnetite-Amphibole var. Ripidolite pseudomorph after Almandine Garnet from Michigamme Mine, Michigammee, Michigan

Chlorite-Magnetite-Amphibole var. Ripidolite pseudomorph after Almandine Garnet from Michigamme Mine, Michigamme, Michigan

Chlorite-Magnetite-Amphibole var. Ripidolite pseudomorph after Almandine Garnet from Michigamme Mine, Michigamme, Michigan

Chlorite-Magnetite-Amphibole var. Ripidolite pseudomorph after Almandine Garnet from Michigamme Mine, Marquette County, Michigan

Chlorite-Magnetite-Amphibole var. Ripidolite pseudomorph after Almandine Garnet from Michigamme Mine, Marquette County, Michigan

Chlorite-Magnetite-Amphibole var. Ripidolite pseudomorph after Almandine Garnet from Michigamme Mine, Marquette County, Michigan

Chlorite-Magnetite-Amphibole var. Ripidolite pseudomorph after Almandine Garnet from Michigamme Mine, Marquette County, Michigan

Chlorite-Magnetite-Amphibole var. Ripidolite pseudomorph after Almandine Garnet from Michigamme Mine, Marquette County, Michigan

Chlorite-Magnetite-Amphibole var. Ripidolite pseudomorph after Almandine Garnet from Michigamme Mine, Marquette County, Michigan

Chloritoid var. Masonite from Natick, Kent County, Rhode Island

Choloalite, Tlapallite, Benleonardite in Hessite from Bambollita Mine, Sierra La Huerta, Moctezuma, Sonora, Mexico (Type Locality for Choloalite, Tlapallite, Benleonardite)

Chondrodite and Clinochlore from Tilly Foster Iron Mine, near Brewster, Putnam County, New York

Chondrodite and Magnetite from Tilly Foster Iron Mine, near Brewster, Putnam County, New York

Chondrodite with Magnesioferrite from Monte Somma, Vesuvius, Campania, Italy (Type Locality for Magnesioferrite)

Chondrodite with Magnetite from Tilly Foster Iron Mine, near Brewster, Putnam County, New York

Chondrodite with Magnetite from Tilly Foster Iron Mine, near Brewster, Putnam County, New York

Chondrodite with Magnetite and Clinochlore from Tilly Foster Iron Mine, near Brewster, Putnam County, New York

Chondrodite, Calcite, and Diopside from Newton, Sussex County, New Jersey

Chondrodite, Magnetite, Calcite from Palabora Mine, Limpopo Province, South Africa

Chondrodite, Spinel, Graphite in Calcite from Warwick, Orange County, New York

Chondrodite, Spinel, Phlogopite in Calcite from Amity-Edenville marble belt, Warwick Township, Orange County, New York

Chromatite from Ma'ale Adumim, Hatrurim formation, West Bank, Palestine (Type Locality for Chromatite)

Chrome Tourmaline from Umba Valley region, Tanzania

Chrome Tourmaline from Daluni, Tanga Province, Tanzania

Chrome Tourmaline from Lindi Province, Tanzania

Chrome Tourmaline from Lindi Province, Tanzania

Chrome Tourmaline from Lindi Province, Tanzania

Chrome-Tourmaline from Tsavo, Taita Taveta District, Kenya

Chromite-Magnesiochromite from Delight Quarry, Soldiers' Delight Ridge, Baltimore County, Maryland

Chrysoberyl (14 gem-grade twinned crystals) from Pancas, Espírito Santo, Brazil

Chrysoberyl (17.0 grams of facet-grade rough) from Zambia

Chrysoberyl (69.6 grams of lapidary rough) from Zambia

Chrysoberyl (drill bit-twinned crystals) from Ambatomanoina, Fianarantsoa, Madagascar

Chrysoberyl (gem-grade) from Mogok District, 115 km NNE of Mandalay, Mandalay Division, Myanmar (Burma)

Chrysoberyl (sixling-twinned crystals) from Miakanjovato, near Lake Alaotra, northeast of Ambatosoratra, Madagascar

Chrysoberyl (twinned crystals) from Espírito Santo, Brazil

Chrysoberyl (twinned crystals) from Rakwana, Sabaragamuwa, Sri Lanka

Chrysoberyl (twinned crystals) from Espírito Santo, Brazil

Chrysoberyl (twinned crystals) from Colatina, Espírito Santo, Brazil

Chrysoberyl (twinned crystals) from Colatina, Espírito Santo, Brazil

Chrysoberyl (twinned crystals) from Colatina, Espírito Santo, Brazil

Chrysoberyl (twinned crystals) from Colatina, Espírito Santo, Brazil

Chrysoberyl (twinned crystals) from Colatina, Espírito Santo, Brazil

Chrysoberyl (twinned crystals) from Colatina, Espírito Santo, Brazil

Chrysoberyl (twinned crystals) from Colatina, Espírito Santo, Brazil

Chrysoberyl (twinned crystals) from Colatina, Espírito Santo, Brazil

Chrysoberyl (twinned crystals) from Colatina, Espírito Santo, Brazil

Chrysoberyl (twinned crystals) from Colatina, Espírito Santo, Brazil

Chrysoberyl (twinned crystals) from Itaguaçu, Espirito Santo, Brazil

Chrysoberyl (twinned crystals) from Colatina, Espirito Santo, Brazil

Chrysoberyl (twinned crystals) from Espírito Santo, Brazil

Chrysoberyl (twinned crystals) from Miakanjovato, near Lake Alaotra, northeast of Ambatosoratra, Madagascar

Chrysoberyl (twinned crystals) from Espírito Santo, Brazil

Chrysoberyl (twinned crystals) from Pancas, Espírito Santo, Brazil

Chrysoberyl (twinned crystals) from Pancas, Espírito Santo, Brazil

Chrysoberyl (twinned crystals) from Pancas, Espírito Santo, Brazil

Chrysoberyl (twinned crystals) from Espírito Santo, Brazil

Chrysoberyl (twinned crystals) from Espírito Santo, Brazil

Chrysoberyl (twinned crystals) from Espírito Santo, Brazil

Chrysoberyl (twinned crystals) from Espírito Santo, Brazil

Chrysoberyl (twinned crystals) from Juerana Mine, Bahia, Brazil

Chrysoberyl (twinned crystals) from Colatina, Espírito Santo, Brazil

Chrysoberyl (twinned crystals) from Anjanabonoina, Betafo District, Antananarivo, Madagascar

Chrysoberyl (twinned crystals) from Colatina, Espírito Santo, Brazil

Chrysoberyl (twinned crystals) from Colatina, Espírito Santo, Brazil

Chrysoberyl (twinned crystals) from Fazenda Santa Isabel Pancas, Espírito Santo, Brazil

Chrysoberyl (twinned crystals) from Colatina, Espírito Santo, Brazil

Chrysoberyl (twinned crystals) from Colatina, Espírito Santo, Brazil

Chrysoberyl (twinned crystals) on Muscovite from Rio das Pratinhas, Arataca, Bahia, Brazil

Chrysoberyl (V-twinned crystals) from Rio das Pratinhas, Arataca, Bahia, Brazil

Chrysoberyl (V-twinned crystals) from Espírito Santo, Brazil

Chrysoberyl (V-twinned crystals) from Rio das Pratinhas, Arataca, Bahia, Brazil

Chrysoberyl (V-twinned crystals) from Ambatondrazaka District, Toamasina Province, Madagascar

Chrysoberyl in Albite from Witt Hill, Greenwood, Maine

Chrysoberyl in Quartz from Witt Hill, Greenwood, Oxford County, Maine

Chrysoberyl on Taramite from Tsitondroina, Fianarantsoa, Madagascar

Chrysoberyl twinned crystals from Espírito Santo, Brazil

Chrysoberyl var. Alexandrite from Fort Victoria, Zimbabwe

Chrysoberyl var. Alexandrite from Carnaiba District, Bahia, Brazil

Chrysoberyl var. Alexandrite from Carnaiba District, Bahia, Brazil

Chrysoberyl var. Alexandrite from Takowaya River, Sverdlovsk, Russia

Chrysoberyl var. Alexandrite from Carnaiba District, Bahia, Brazil

Chrysoberyl var. Alexandrite from Ural Mountains, Russia

Chrysoberyl var. Alexandrite from Tanzania

Chrysoberyl var. Alexandrite from Ural Mountains, Russia

Chrysoberyl var. Alexandrite from Malyshevo Mine, Yekaterina Oblast, Ural Mountains, Russia

Chrysoberyl var. Alexandrite from Minas Gerais, Brazil

Chrysoberyl var. Alexandrite from Minas Gerais, Brazil

Chrysoberyl var. Alexandrite from Santa Teresa, Espírito Santo, Brazil

Chrysoberyl var. Alexandrite from Masvingo (formerly Fort Victoria), Masvingo Province, Zimbabwe

Chrysoberyl var. Alexandrite from Fort Victoria, Masvingo District, Zimbabwe

Chrysoberyl var. Alexandrite from Masvingo (formerly Fort Victoria), Masvingo Province, Zimbabwe

Chrysoberyl var. Alexandrite from Masvingo (formerly Fort Victoria), Masvingo Province, Zimbabwe

Chrysoberyl var. Alexandrite from Masvingo (formerly Fort Victoria), Masvingo Province, Zimbabwe

Chrysoberyl var. Alexandrite (sixling-twinned crystals) from Girdlestone Farm, Mwenezi, Masvingo, Zimbabwe

Chrysoberyl var. Alexandrite (sixling-twinned crystals) from Novello Mine, Masvingo, Zimbabwe

Chrysoberyl var. Alexandrite in Beryl var. Emerald from Carnaiba District, Bahia, Brazil

Chrysoberyl var. Cat's-Eye Chrysoberyl (twinned crystals) from Itaguaçu, Espirito Santo, Brazil