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Cafarsite: Ca8(Ti,Fe++,Fe+++,Mn)6-7(As+++O3)12·4(H2O)
Comments: Octahedron of cafarsite with a green coloration (?) on a gneiss matrix. Location: Vasl D' Aosta, Italy. Scale: 4.6x4.5x3.2 cm. © Isaias Casanova / IC Minerals
Comments: Small, cubic crystal of cafarsite on matrix. Location: Wannigletscher, Binntal, Switzerland. Scale: Crystal size 0.5 cm. © Rob Lavinsky
Cafetite: Ca(Fe,Al)2Ti4O12·4(H2O)
Comments: Ocher-colored aggregates of cafetite in pegmatite, intimately mixed with iron hydroxides. Location: Mount Rasvumchorr, Khibiny Massif, Kola Peninsula, Murmansk District, Russia. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Cahnite: Ca2B(AsO4)(OH)4
Comments: White, translucent cahnite crystal on hodgkinsonite. Location: Franklin, Sussex County, New Jersey, USA. Scale: Size Not Given. © Lou Perloff / Photo Atlas of Minerals
Calaverite: AuTe2
Comments: Quartz matrix with abundant calaverite crystals. Location: Cripple Creek, Teller County, Colorado, USA. Scale: Size Not Given. © Lou Perloff / Photo Atlas of Minerals
Calciborite: CaB2O4
Comments: Translucent colorless crystalline calciborite. Location: Novofrolovskoye, Sverdlovsk District, Northern Urals, Russia. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Calcioancylite-(Ce): CaCe(CO3)2(OH)·(H2O)
Comments: Gray calcio-ancylite pseudomorphs after remondite crystals up to 4 cm long. Location: Poudrette quarry (Demix quarry; Uni-Mix quarry; Desourdy quarry), Mt Saint-Hilaire, Rouville Co., Québec, Canada. Scale: 5x4x4 cm. © John Betts - Fine Minerals
Calcioandyrobertsite-1M: KCaCu5(AsO4)4[As(OH)2O2]·2(H2O) Tennantite: (Cu,Fe)12As4S13
Comments: Vein of blue calcioandyrobertsite in massive dark gray tennantite. The vein of calcioandyrobertsite extends for 0.8cm. Location: Tsumeb Mine, Tsumeb, Namibia. Scale: Specimen size 1.1 x 0.5 cm. © John Veevaert
Calcioburbankite: Na3(Ca,REE,Sr)3(CO3)5 Aegirine: NaFe+++Si2O6
Comments: Tan crystal spray of calcioburbankite on dark green aegirine. Location: Mont Saint Hilaire, Quebec, Canada. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Calciocopiapite: CaFe+++4(SO4)6(OH)2·19(H2O)
Comments: Greenish yellow crystalline crust of calciocopiapite. Location: Borate, San Bernardino County, California, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Calcioferrite: Ca4Fe++(Fe+++,Al)4(PO4)6(OH)4·12(H2O)
Comments: Whitish green botryoidal crust of calcioferrite on matrix. Location: Brugues, Barcelona, Catalunya, Spain. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Calciogadolinite: CaREE(Fe+++)Be2Si2O10 Gadolinite-(Y): Y2Fe++Be2Si2O10
Comments: Black vitreous, metamict massive gadolinite-(Y) also known as calcian gadolinite. Location: Ytterøya Mine, Røvika, Ytterøya (island), Levanger, Nord-Trondelag, Norway. Scale: See Image. © Rruff Database
Calciohilairite: CaZrSi3O9·3(H2O) Kuzmenkoite-Mn: (K,Na)2(Mn,Fe)(Ti,Nb)4[Si4O12]2(OH)4·5(H2O)
Comments: White rhombododecahedral crystals of calciohilairite associated with orange=brown stout prismatic kuzmenkoite-Mn on matrix. Location: Flora Mt, Lovozero Massif, Kola Peninsula, Murmanskaja Oblast', Northern Region, Russia. Scale: FOV ~1x1 cm. © Pavel M. Kartashov
Calciopetersite: CaCu6[(PO4)2(PO3OH)(OH)6]·3(H2O)
Comments: SEM image of calciopetersite in fine radiating spray; note the hexagonal outline of crystals. (CanMin, v43:1393). Location: Domasiov nad Bystrici, Czech Republic. Scale: See Image. © J. Sejkora / Canadian Mineralogist
Calciotantite: Ca(Ta,Nb)4O11 Tantalite-(Mn): MnTa2O6
Comments: SEM image showing calciotantite (CT), manganotatntalite (MTT), microlite (MT) and lithiowodginite (LW) association. Location: Granitic pegmatites, Kalba, Kazakhstan. Scale: Scale bar 100 µm and 10 µm. © Diederik Visser
Calciouranoite: (Ca,Ba,Pb)U2O7·5(H2O) Metacalciouranoite: (Ca,Na,Ba)U2O7·2(H2O)
Comments: Cryptocrystalline looking, greasy yellow blotches, of amorphous calciouranoite (probably, in part, dehydrated to matacalciouranoite). Location: Oktyabr'skoye Mo-U deposit, east Transbaikal region, Russia. Scale: See Image. © Rruff Database
Calcite: CaCO3 Quartz: SiO2
Comments: Purple-colored druse of amethystine quartz and white calcite. Location: Rio Grande do Sul, Brazil. Scale: Sample size 20 cm. © Dave Barthelmy
Calcite: CaCO3 Beryl: Be3Al2Si6O18
Comments: Transparent emerald, the green variety of beryl on calcite (marble) matrix. Location: Coscuez, Boyacá, Colombia. Scale: 2.5 x 2.5 cm. © Fabre Minerals
Calcite: CaCO3
Comments: White, divergent calcite scalenohedral crystals. Location: Santa Eulalia, Chihuahua, S.A., Mexico. Scale: 8 cm. © Dave Barthelmy
Comments: Cream-colored crystalline aggregate of calcite crystals. Location: Rio Grande do Sul, Brazil. Scale: 20 cm. © Dave Barthelmy