Mineral Specimen Images (C)

Columbite-(Mn): (Mn,Fe++)(Nb,Ta)2O6  
Plumbopyrochlore: (Pb,Y,U,Ca)2-xNb2O6(OH)

Comments: Yellow-brown plumbopyrochlore crystalline crust over black manganocolumbite grain. Such plumbopyrochlore-manganocolumbite ovoids with different grade of replacement are very typical for the locality.
Location: Amazonite pegmatites of Ploskaya Mt, Western Keivy Massif, Kola Peninsula, Murmanskaja Oblast', Northern Region, Russia. Scale: Picture Size 12x10 mm.
© Pavel M. Kartashov

Colusite: Cu12-13V(As,Sb,Sn,Ge)3S16  
Arsenosulvanite: Cu3(As,V)S4

Comments: Bronzy, metallic tetragonal crystals of colusite (arsenosulvanite) in white marble.
Location: Val Bona quarry, Carrara, Italy. Scale: Picture size 1 cm.
© Dave Barthelmy

Colusite: Cu12-13V(As,Sb,Sn,Ge)3S16  
Vinciennite: Cu10Fe4Sn(As,Sb)S16

Comments: Polished section (PPL) of a Fe-rich rim of vinciennite (vinc) on earlier colusite (col). Matrix is bornite (bn).
Location: Kidd Creek Volcanogenic Massive Sulfide deposit, Western Abitibi Subprovince, Timmins, Ontario, Canada. Scale: Picture Size 0.5 mm.
© National Resouces of Canada

Comancheite: Hg13(Cl,Br)8O9

Comments: Small orange crystals of comancheite on matrix.
Location: Mariposa mine, Terlingua, Terlingua district, Brewster County, Texas, USA. Scale: Picture size 1.4 mm.
© Thomas Witzke / Abraxas-Verlag

Combeite: Na2Ca2Si3O9

Comments: Crystalline cleavage fragment of combeite.
Location: Mont Saint Hilaire, Quebec, Canada. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Compreignacite: K2(UO2)6O4(OH)6·8(H2O)

Comments: Yellow crystals of compreignacite on matrix.
Location: Ronneburg U deposit, Gera district, Thuringia, Germany. Scale: Picture size 1.5 mm.
© Thomas Witzke / Abraxas-Verlag

Congolite: (Fe++,Mg,Mn)3B7O13Cl

Comments: Pearly crystalline grains of congolite.
Location: Brazzaville, Pool, Congo. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Conichalcite: CaCu(AsO4)(OH)  
Willemite: Zn2SiO4

Comments: Conichalcite with willemite.
Location: Collected from the 30 level of the Tsumeb mine. Tsumeb, Namibia. Scale: 2.1 x 1.5 cm.
© John Veevaert

Conichalcite: CaCu(AsO4)(OH)  
Cornubite: Cu5(AsO4)2(OH)4

Comments: Blue green crystalline cornubite alteration of enargite with green conichalcite in white calcite.
Location: Lime Bluff Quarry, Lycoming County, Pennsylvania, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Conichalcite: CaCu(AsO4)(OH)  
Barahonaite-(Fe): (Ca,Cu,Na,Fe+++,Al )12Fe+++2(AsO4)8(OH,Cl)x·nH2O

Comments: Micro yellow, platy barahonaite-(Fe) crystals associated with green "beads" of conichalcite, yellowish, earthy arseniosiderite and micro olivenite crystals.
Location: Dolores prospect near the village of Pastrana, in the Province of Murcia of southeastern Spain. Scale: Specimen Size 6 x 4 x 2 cm.
© Tom Loomis / Dakota Matrix

Connellite: Cu19Cl4(SO4)(OH)32·3(H2O)

Comments: Blue acicular crystals of connellite.
Location: Deep Creek Mountains, Tooele County, Utah, USA. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Cookeite: LiAl4(Si3Al)O10(OH)8

Comments: Large tan-colored cookeite epimorph after a large 12 cm quartz crystal. The outer faces of the epimorph are overgrown with milky quartz crystals up to 15 mm long.
Location: Bennett & Orchard Pit mines, Buckfield, Oxford Co., Maine, USA. Scale: 17x17x11 cm.
© John Betts - Fine Minerals

Coombsite: K(Mn++,Fe++,Mg)13(Si,Al)18O42(OH)14

Comments: Sawed slab with brownish veining in pink (?) matrix.
Location: Watson's Beach, Otago, South Island,, New Zealand. Scale: 3x2cm x 5mm.
© Tom Loomis / Dakota Matrix

Cooperite: (Pt,Pd,Ni)S  
Cherepanovite: RhAs  
Platinum: Pt

Comments: Creamy-grayish fractured grains of cherepanovite with gray granular cooperite and white massive grains of iridian ruthenian platinum. Polished section in reflected light.
Location: Placer Deposit, Northern Pekul'nei River, Pekul'nei Range, Chukotka (Tchukotka) Okrug, Chukot Peninsula, Far-Eastern Region, Russia. Scale: Picture size 0.12 mm.
© Thomas Witzke / Abraxas-Verlag

Cooperite: (Pt,Pd,Ni)S  
Osmium: (Os,Ir)  
Vasilite: (Pd,Cu)16(S,Te)7  
Vysotskite: (Pd,Ni)S

Comments: BSE image taken with a SEM of the sulfide-dominant microparagenesis filling a gas vacuole. Cooperite crystal surrounded by Pd-Cu-Pt-S phase (vasilite?), vysotskite and osmium laths (white) in chalcopyrite-bornite matrix (dark). (CanMin 38:1258).
Location: Pustaya River placer deposit, situated within the Koryak-Kamchatka platinum-bearing belt of Alaskan-type intrusions in eastern Russia. Scale: See Image.
© Canadian Mineralogist

Copiapite: Fe++Fe+++4(SO4)6(OH)2·20(H2O)

Comments: Brownish yellow tabular crystals of copiapite.
Location: Saghand, near Yazd, Yadz Province, Iran. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Copiapite: Fe++Fe+++4(SO4)6(OH)2·20(H2O)  
Rozenite: Fe++SO4·4(H2O)  
Ferrinatrite: Na3Fe+++(SO4)3·3(H2O)

Comments: White powdery rozenite coating with yellow ferrinatrite on purple copiapite.
Location: Le Cetine Mine, Siena, Tuscany, Italy. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Copper: Cu

Comments: Native copper forming a branching cluster of crystals with some massive calcite.
Location: Houghton County, Michigan, USA. Scale: Crystal size 1.5 cm.
© Dan Weinrich

Coquandite: Sb6O8(SO4)·(H2O)

Comments: Silky coquandite with stibnite.
Location: Pereta mine, Grosseto, Tuscany, Italy. Scale: Picture size 5 mm.
© Thomas Witzke / Abraxas-Verlag

Coquimbite: Fe+++2(SO4)3·9(H2O)

Comments: Brownish yellow tabular crystals of coquimbite.
Location: Lavender Pit, Bisbee, Cochise County, Arizona, USA. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals