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This specimen is about 10 cm tall. It contains white quartz, surrounded by deep purple-black covellite and golden pyrite. Covellite is a cupper sulfide with the composition CuS. Pyrite is an iron sulfide with composition FeS2. Quartz, Si02, is one of the most abundant minerals on earth. Mineral

Covellite

covellite

Formula
CuS
Cowlesite FOV: 5.9 x 4.3 mm Locality: Four Mile Quarry, Porter, Grays Harbor Co., Washington, USA Description: Thanks to Ralph Thomas. MOB coll Mineral

Cowlesite

cowlesite

Formula
Ca(Al2Si3)O10·(5-6)H2O
Mohs
5
Mineral

Coyoteite

coyoteite

Formula
NaFe3S5·2H2O
Variscite, Crandallite Locality: Little Green Monster Variscite Mine, Clay Canyon, Fairfield, Oquirrh Mts, Utah County, Utah, USA (Locality at mindat.org) Size: 7.8 x 7.3 x 0.4 cm. A gorgeous slab, polished on both sides, with very intricate patterns of the green and yellow phosphates, variscite and crandallite from the famous Utah locality of the Little Green Monster Variscite Mine. The yellow crandallite surrounding the variscite has exceptional banding. There is also a bit of white wardite. Mineral

Crandallite

crandallite

Formula
CaAl3(PO4)(PO3OH)(OH)6
Mohs
5
White crystal aggregates of the very rare magnesium sulphate mineral cranswickite (IMA 2010-016) from the type locality and only one of the two known localities worldwide: Calingasta, San Juan, Argentina. Mineral

Cranswickite

cranswickite

Formula
Mg(SO4)·4H2O
White/colorless crystals of the extremely rare Sr carbonate-phosphate mineral crawfordite from type and only known locality worldwide in Russia (Koashva Mountain, Khibiny Massif, Murmansk Oblast, Russian Federation). Ex Vandenbroucke Museum collection specimen, from Waregem, Belgium. Mineral

Crawfordite

crawfordite

Formula
Na3Sr(CO3)(PO4)
Creaseyite, Mimetesite, Pyromorphite (FOV: 3 x 2 mm aprox) Locality: Soga quarry, Camiña, Pampa del Tamarugal, Iquique Province, Tarapacá Region, Chile Original description: A unique combination of light smooth green tiny acicular (1-2 mm. across) Creaseyite xls (analysed by Dr. J. Schluter), growed on orange-yellow Mimetite xls, and some white Pyromorphite grains: on right wing tip, massive bluish Chrysocolla Mineral

Creaseyite

creaseyite

Formula
Cu2Pb2Fe³⁺2Si5O17·6H2O
Crednerite Locality: Torr Works Quarry (Merehead Quarry), Cranmore, Somerset, England, UK (Locality at mindat.org) Size: 7 x 4 x 4 cm. This is an extremely rare copper species, CuMnO2; and a very rich specimen featuring a beautiful, bright, metallic spray of flat crednerite crystals to 2 cm. Ex. Eric Asselborn Collection. Mineral

Crednerite

crednerite

Formula
CuMnO2
Creedite Locality: Mina Potosi Santa domingo, Santa Eulalia District, Municipio de Aquiles Serdán, Chihuahua, Mexico Mineral

Creedite

creedite

Formula
Ca3Al2(SO4)(OH)2F8·2H2O
Mohs
4
Mineral

Crerarite

crerarite

Formula
Pt2-x(Bi,Pb)11(S,Se)11
Crichtonite, Quartz Locality: St Christophe-en-Oisans, Bourg d'Oisans, Isère, Rhône-Alpes, France (Locality at mindat.org) Crichtonite is a very rare, complex oxide containing a number of rare earths. This is surely an old piece, as it comes from the now defunct old workings of the TYPE LOCALITY in Isere. This piece features sharp crystals of up to 2 mm, on contrasting matrix, and they are readily visible. 6 x 4.6 x 3.2 cm. Mineral

Crichtonite

crichtonite

Formula
Sr(Mn,Y,U)Fe2(Ti,Fe,Cr,V)18(O,OH)38
Silvery metallic crystals of the extremely rare Tl-Ag-Au mineral criddleite from the type locality in Hemlo mine, Ontario, Canada. Completely analyzed specimen by SEM/EDS. Ex Vandenbroucke Museum collection from Waregem, Belgium. Mineral

Criddleite

criddleite
Mineral

Crimsonite

crimsonite

Formula
PbFe³⁺2(PO4)2(OH)2
Cristobalite, Fayalite Locality: Canyon Butte occurrence (Couger Butte), Canyon Butte, Siskiyou County, California, USA (Locality at mindat.org) Obsidian (volcanic glass) cools too quickly to crystallize. Thus, it is unusual to see minerals attached. The spheres of high temperature cristobalite (SiO2) are actually the result of devitrification, or loss of silica from the obsidian. Most unusual. 5.9 x 3.8 x 3.8 cm Mineral

Cristobalite

cristobalite

Formula
SiO2
Mohs
6.5
Mineral

Crocobelonite

crocobelonite
Pyromorphite, crocoite - Le Cantonnier vein, Nontron, Nontron, Dordogne, Nouvelle-Aquitaine, France Mineral

Crocoite

crocoite

Formula
PbCrO4
Cronstedtite and Quartz from Kutna Hora, Czechia Mineral

Cronstedtite

cronstedtite

Formula
Fe²⁺2Fe³⁺((Si,Fe³⁺)2O5)(OH)4
Mohs
3.5
Mineral

Cronusite

cronusite

Formula
Ca0.2CrS2 * 2 H2O
Metallic crystal aggregates and crusts of the extremely rare crookesite, a copper-thallium-silver selenide, a mineral full of rare elements; in fact it's the only mineral of almost 5000 that contains Ag, Tl and Se at the same time. Type locality mineral. From: Skrikerum Mine, Valdemarsvik, Östergötland, Sweden. Mineral

Crookesite

crookesite

Formula
Cu7TlSe4
Mineral

Crowningshieldite

crowningshieldite

Formula
(Ni0.9Fe0.10)S
Mineral

Cryobostryxite

cryobostryxite

Formula
KZnCl3·2H2O
Cryolite – topotype -Former collection of the Faculty of Pharmacy of Paris Locality: Ivigtut Cryolite deposit, Ivittuut (Ivigtut), Arsuk Firth, Arsuk, Kitaa (West Greenland) Province, Greenland Size: 8.8 by 6.7 by 5 centimetres (3.5 in × 2.6 in × 2.0 in) Mineral

Cryolite

cryolite

Formula
Na3AlF6
White massive cryolithionite from Ivigtut, Ivittuut, Arsuk Fjord, Sermersooq, Greenland. Mineral

Cryolithionite

cryolithionite

Formula
Na3Al2(LiF4)3
Mineral

Cryptochalcite

cryptochalcite

Formula
K2Cu5O(SO4)5