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Coquimbite Locality: Calf Mesa, San Rafael District (San Rafael Swell), Emery County, Utah, USA (Locality at mindat.org) Superb, sharp crystals to 1 cm, translucent, look like purple corundum. Instead they are this rare iron sulfate. This strange mineral is rarely found in specimens larger than a thumbnail or a crust with small crystals. Here is a small cab, with rich purple color (the lighting makes it look more even than in person, where I admit the color is more splotchy in appearance). Still, it is not unattractive and this is the best Utah specimen of the mineral I have seen for sale. Not stable in high humidity, I am told (this piece has clearly lasted many decades already, so it is not highly unstable, either). Marty's number on this was 1718 , indicating an early acquisition date. 6.7 x 5.2 x 2.5 cm Mineral

Coquimbite

coquimbite

Mohs
2
Mineral

Coralloite

coralloite

Formula
Mn²⁺Mn³⁺2(AsO4)2(OH)2·4H2O
Corderoite, Cinnabar Locality: McDermitt Mine (Cordero Mine; Old Cordero Mine), Opalite District, Humboldt County, Nevada, USA (Locality at mindat.org) Size: 6.2 x 4.4 x 4.0 cm. Corderoite is a very rare mercury chloride sulfide and this excellent layered specimen is from the Type Locality - the McDermitt (Cordero) Mine of Nevada. This is very rich mercury ore. Dark red bands of microcrystalline to massive cinnabar alternate with layers of tan limonite. The corderoite is the rich dusting of the yellow-tan microcrystals found on all sides of the specimen and on both the cinnabar and limonite. Corderoite was not named until 1974, but primary mercury production of this small mine was over before 1941. This material probably dates to that time. From an old European collection. Mineral

Corderoite

corderoite

Formula
Hg²⁺3S2Cl2
Cordierite in rhyolite Locality: Roccatederighi, Roccastrada, Grosseto Province, Tuscany, Italy. Size of view 1.5 cm Mineral

Cordierite

cordierite

Formula
Mg2Al4Si5O18
Cordylite-(Ce) Locality: Demix-Varennes quarry, Saint-Amable sill, Varennes & St-Amable, Lajemmerais RCM, Montérégie, Québec, Canada FOV 1.7 x 1.4 mm. Found July 1998. MOB coll. The ID has been confirmed by Pavel Kartashov. He has also determined that white zones are due to surface inclusions of tabular xls of parisite-(Ce). Mineral

Cordylite-(Ce)

cordylite-(Ce)

Formula
(Na,Ca,☐)BaCe2(CO3)4(F,O)
Mohs
4.5
Mineral

Cordylite-(La)

cordylite-(La)

Formula
NaCaBa2La3Sr(CO3)8F2
:Locality: Serra da Mina, Cercal, Evora District, Portugal Class: Crystals on Matrix Size: 5 × 3.5 × 3 cm Description: This is a very rich corkite specimen formed by several extremely brilliant and lustrous crystals, peppering a colorfull goethite matrix. Corkite is an uncommon, low-temperature, secondary mineral occurring in the oxidised zones of hydrothermal base-metal deposits. Really amazing under loupe. Mineral

Corkite

corkite

Formula
PbFe³⁺3(SO4)(PO4)(OH)6
Cornetite Locality: L'Etoile du Congo Mine (Star of the Congo Mine; Kalukuluku Mine), Lubumbashi (Elizabethville), Southern area, Katanga Copper Crescent, Katanga (Shaba), Democratic Republic of Congo (Zaïre) Size: 7.8 x 6.0 x 2.2 cm. Mineral

Cornetite

cornetite

Formula
Cu3PO4(OH)3
Cornubite Field of view: 1 mm Locality: Daly Mine, Daly Gorge, North Flinders Ranges, South Australia Locality at mindat.org: Daly Mine, Yudnamutana District, Arkaroola (Arkaroola Wilderness Sanctuary; Arkaroola Station), Pastoral Unincorporated Area, South Australia, Australia Mineral

Cornubite

cornubite

Formula
Cu5(AsO4)2(OH)4
Mohs
4
Cornwallite Locality: Pastrana, Mazarrón-Águilas, Murcia, Spain (Locality at mindat.org) Size: 4.3 x 3.7 x 2.2 cm. Cornwallite is an uncommon Copper Arsenate which gets its name from the classic English mining district. This specimen is from Spain and features some small yet beautiful emerald green Cornwallite aggregates on matrix. Mineral

Cornwallite

cornwallite

Formula
Cu5(AsO4)2(OH)4
Mohs
4.5
:Excelente ejemplar estalactítico de coronadita, analizado por SEM-EDS, con formas redondeadas, de intenso color gris casi negro. Buen tamaño. De esta localidad clásica para la mineralogía marroquí. Con una matriz de limonita. Pueden consultar más datos de esta especie y localidad en el blog de Rosell Minerals. Localidad: Taouz area, Filon 12, Taouz, Er Rachidia, Meknès-Tafilalet, Marruecos Medidas: 10.8 x 6 x 3.5 cm. Mineral

Coronadite

coronadite

Formula
Pb(Mn⁴⁺6Mn³⁺2)O16
Correianevesite is very rare new mineral, approved on 2013 (IMA 2013-007), and only found in two localities worldwide, but being this one in Minas Gerais the best one, by far (Cigana (Jocão), Galiléia, Minas Gerais, Brazil). The mineral, that is a Fe-Mn phosphate, forms nice fan-like aggregates of brown very well defined crystals. Mineral

Correianevesite

correianevesite

Formula
Fe²⁺Mn²⁺2(PO4)2·3H2O
Grey crystal aggregates of the rare mineral corrensite on a quartz matrix. From Luzerne County, Pennsylvania, United States of America. Ex Vandenbroucke Museum collection from Waregem, Belgium. Mineral

Corrensite

corrensite

Formula
(Mg,Fe)9((Si,Al)8O20)(OH)10 * nH2O
Cortesognoite, brownish microcrystalline aggregate in hydrothermally altered silicified wood. Field of view: 3 mm. Molinello mine, Graveglia Valley, Northern Apennines, Liguria, Italy. The image is published in an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/). Mineral

Cortesognoite

cortesognoite

Formula
CaV2Si2O7(OH)2·H2O
Corundum Mineral

Corundum

corundum

Formula
Al2O3
Mohs
9
Very dark green , almost black, crystal aggregates of the rare vanadium mineral corvusite from Utah (Temple Mountain, San Rafael, Emery County, Utah, United States of America). Ex Vandenbroucke Museum collection from Waregem, Belgium. Mineral

Corvusite

corvusite

Formula
(Na,Ca,K)1-ₓ(V⁵⁺,V⁴⁺,Fe²⁺)8O20·4H2O
Cosalite - Locality: Georg Mine near Willroth, Westerwald - Exposed in the Mineralogical Museum, Bonn, Germany Mineral

Cosalite

cosalite

Formula
Pb2Bi2S5
Platy pink coskrenite-(Ce) crystals about 0.8 mm in a matrix of magnesian apjohnite (mostly dehydrated) and epsomite. From: Alum Cave Bluff, Great Smoky Mountains, Sevier Cou, Tennessee, United States of America. Mineral

Coskrenite-(Ce)

coskrenite-(Ce)

Formula
(Ce,Nd,La)2(C2O4)(SO4)2 * 12H2O
Mineral

Cossaite

cossaite

Formula
(Mg0.5,☐)Al6(SO4)6(HSO4)F6·36H2O
Silvery crystal aggregates and crystals of the very rare minerals paracostibite and costibite, from Getön Silver Mine, Persberg, Filipstad, Värmland County, Sweden. Both minerals occur together in the TL. Associated to golden chalcopyrite. Paracostibite-costibite in visible crystals like in the photo is very rare. Ex Vandenbroucke Museum collection from Waregem, Belgium. Mineral

Costibite

costibite

Formula
CoSbS
Cotunnite (Field of view 0,9 mm) Locality: Ferruginosa mine, Cabo de Palos Range, Cartagena, Murcia, Spain Description: Cavernous cotunnite crystals with tiny caracolite crystals. Collected 2017 by Christian Rewitzer and C. Utrera. Mineral

Cotunnite

cotunnite

Formula
PbCl2
Mohs
2.5
Vanadium and vanadium-bearing minerals in the Bragino massive sulfide ores: (a–d) Fe-V oxides; (e,f) Ti-V oxides; (g,h) Sc-V-bearing crichtonite group minerals (a–i), secondary electron and back-scattered electron images, respectively; Ab, albite; Byr, byrudite; Chl, chlorite; Cou, coulsonite; Cri, cricthonite group minerals; Fbr, ferberite; Ilm, ilmenite; Kyz, kyzylkumite; Ms, muscovite; Mol, molybdenite; Nol, nolanite; Po, pyrrhotite; Py, pyrite; Qz, quartz; Rt, rutile; Sd, siderite; Sen, senaite; Sp, sphalerite). The image is published in an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/). Mineral

Coulsonite

coulsonite

Formula
Fe²⁺V³⁺2O4
Mineral

Cousinite

cousinite

Formula
MgU2Mo2O11 * 6H2O
Mineral

Coutinhoite

coutinhoite

Formula
Th_{x}Ba_(1-2x)(UO2)2Si5O13 * (H2O)1+y