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Minerals

6323 results

Mineral

Colimaite

colimaite

Formula
K3VS4
Purple crystal aggregates of the extremely rare mineral colinowensite (IMA2012-060) associated to majoritary blue effenbergerite from the type and only known locality worldwide in Wessels mine, Southafrica. Color is the basic distinctive way to differentiate colinowensite from effenbergerite since the first one is cleary purple and the second one is bright blue. This is difficult to see in the pictures, but it is easily seen with the specimen at hand. Named in honor of Colin R. Owen (1937 - 26 October 2020), a mineral dealer from Somerset West, South Africa. He provided the first specimens for study. Found in the Central-Eastern orebody of the Wessel's mine. Mineral

Colinowensite

colinowensite

Formula
BaCuSi2O6
Collinsite from the Rapid Creek area of northern Yukon, Canada. Held in the A. E. Seaman Mineral Museum. Mineral

Collinsite

collinsite

Formula
Ca2Mg(PO4)2·2H2O
Mineral

Colomeraite

colomeraite

Formula
NaTi³⁺Si2O6
Coloradoite, Pyrite, Quartz Locality: Bessie G Mine, La Plata District (California District), La Plata County, Colorado, USA (Locality at mindat.org) Size: 10.1 x 4.7 x 2.8 cm Coloradoite is a rare mercury telluride named for the type localities which are in Colorado. It is found in hydrothermal, tellurium bearing precious metal veins. Crystals and platelets of grayish-black coloradoite, accented with brassy, microcrystalline pyrite richly cover the sculptural vein matrix of quartz. Very seldom will you see a coloradoite specimen in cabinet size quality and richness. Mineral

Coloradoite

coloradoite

Formula
HgTe
Colquiriite Locality: Serra Branca pegmatite, Pedra Lavrada, Borborema mineral province, Paraíba, Northeast Region, Brazil Picture width 2 mm. Collection and photograph Christian Rewitzer Mineral

Colquiriite

colquiriite

Formula
CaLiAlF6
Ferrocolumbite Locality: Governador Valadares, Doce valley, Minas Gerais, Southeast Region, Brazil (Locality at mindat.org) Size: cabinet, 13.5 x 8.9 x 1.6 cm Ferrocolumbite This is certainly the largest, and also one of the best specimens of ferrocolumbite I have seen from ANY locale. It was part of Bancroft's competition worldwide case, 30 years or more ago, and comes with his "custom foam base" which is of the style used at that time (tacky...). It is a huge and well formed crystal with good luster, a rich chocolate-brown color, and with interesting vertical striations. The termination is pristine and only the back side is contacted - otherwise it is complete all around! This specimen has to be considered one of the finest of its species. Absolutely mind boggling! Mineral

Columbite-(Fe)

columbite-(Fe)

Formula
Fe²⁺Nb2O6
Columbite Locality: Galiléia, Doce valley, Minas Gerais, Southeast Region, Brazil (Locality at mindat.org) WOW! This is an unusual pseudocubic crystal of columbite with edges to 3.3 cm long. The crystal is deep black in color, with a nice luster but with slight pitting on the faces. One side of the crystal is contacted. Very large example of the classic Brazilian coloumbites. A couple of collection labels come with piece. 3.4 x 3.3 x 3.1 cm Mineral

Columbite-(Mg)

columbite-(Mg)

Formula
MgNb2O6
Manganocolumbite, Muscovite Locality: Elizabeth R. Mine, Chief Mountain, Pala District, San Diego County, California, USA (Locality at mindat.org) Size: miniature, 4.8 x 3.8 x 2.6 cm Manganocolumbite, Cleavelandite, Muscovite This is an extremely rare specimen, the best Chuck knows of, from one of the more interesting mines in San Diego County. It features a very equant, sharp, and surprisingly attractive crystal of the rare species Manganocolumbite perched aesthetically on matrix. Ex. Chuck Houser Collection. Mineral

Columbite-(Mn)

columbite-(Mn)

Formula
Mn²⁺Nb2O6
Colusite, Cu3(As,Sn,V,Fe,Te)S4, is the dark colored mineral; quartz is the white mineral. Colusite is typcially brownish to bronze-colored. It is a sulfide of copper and arsenic with vanadium, iron, and tellurium substituting for some of the arsenic. Here it is in visible crystals, but a massive form is more typical. It is found with other sulfides in hydrothermal copper ore veins. This specimen is 2.8 cm across. Mineral

Colusite

colusite

Formula
Cu12VAs3S16
Comancheite, Calcite Locality: Mariposa Mine (California Mountain Mine), Terlingua District, Brewster County, Texas, USA Original description: Yellow ball of comancheite crystals on calcite, field of view 4 mm. K. Nash specimen and photo. Mineral

Comancheite

comancheite

Formula
Hg²⁺55N³⁻24(NH2,OH)4(Cl,Br)34
Pale pink crystal aggregates of the very rare silicate mineral combeite from one of the only 4 localities known worldwide: Mount Oldoinyo Lengai, Arusha Region, Tanzania. Mineral

Combeite

combeite

Formula
Na2Ca2Si3O9
Mineral

Comblainite

comblainite

Formula
Ni4Co³⁺2(CO3)(OH)12·3H2O
Compreignacite from the type locality, Mine de Margnac, Compreignac, Département Haute-Vienne, Region Limousin, Frankreich. (Field of view: 4.6 mm) Mineral

Compreignacite

compreignacite

Formula
K2(UO2)6O4(OH)6·7H2O
Red single crystal of the rare borate mineral congolite from Germany (Bischofferode Potash Works, Bleicherode, Nordhausen, Thuringia, Germany). Ex Vandenbroucke Museum collection from Waregem, Belgium. Mineral

Congolite

congolite

Formula
(Fe²⁺,Mg)3(B7O13)Cl
Conichalcite Locality: Ojuela Mine, Mapimí, Municipio de Mapimí, Durango, Mexico (Locality at mindat.org) Size: 10.4 x 8.9 x 4.2 cm. What you see here as a field of pretty, powdery green conichalcite here is actually made up of thousands of tiny crystalline balls. They form a solid field on the underlying limonite matrix. Pretty contrast between the moss green and rust colors. Quite a large plate for the locality! Mineral

Conichalcite

conichalcite

Formula
CaCuAsO4(OH)
Mohs
4.5
Connellite Locality: Ingadanais Mines, Vila Velha de Rodão, Castelo Branco District, Portugal Field of view 7 mm. Depth of field is achieved with CombineZM. Specimen and photo Leon Hupperichs. This Photo was Mindat.org Photo of the Day - 14th May 2007 Mineral

Connellite

connellite

Formula
Cu36(SO4)(OH)62Cl8·6H2O
Mohs
3
Cookeite Locality: Barra de Salinas district, Barra de Salinas, Coronel Murta, Jequitinhonha valley, Minas Gerais, Southeast Region, Brazil (Locality at mindat.org) Size: cabinet, 10.5 x 5.5 x 4 cm Tourmaline in cast of Cookeite after Tourmaline Like the above specimen, this is an important tourmaline specimen because so few of the multicolored scepters from this famous mine are on any kind of matrix, let alone so appealing and aesthetic a matrix as this one! Also, it has NO repairs. The GEMMY red/green zoned tourmaline crystal, which is doubly terminated, measures 6 x 3 x 2.5 cm and perches gently in the hollowed-out cast of a larger previous generation of green tourmaline. In person, it is really quite a bit more colorful and gemmier than it appears, and the contrast to the yellowish-white cookeite is striking. The upper temrination is freestanding and complete, etched as most BdoS tourmalines are but nevertheless showing a beautiful and colorful tip. Note that the BOTTOM termination of the tourmaline is also fully terminated in a series of trigonal stepped prisms, which is quite obvious in person. The cookeite does not fully cover the tourmaline shell, now hollow, of the original green tourmaline which encloses the new tourmaline. This is also more apparent in person. Lastly, note that in good lighting this can glow with much more color (top photo). Oh, and it is Complete and undamaged! This specimen comes with a custom-made lucite base. Mineral

Cookeite

cookeite

Formula
(Al,Li)3Al2(Si,Al)4O10(OH)8
A massive specimen, with a sawn surface. Collection and photo Erik Vercammen. From: Watsons Beach, Clutha District, Otago Region, New Zealand. Mineral

Coombsite

coombsite

Formula
K(Mn,Fe,Mg)13(Si,Al)18O42(OH)14
Outstanding specimen of the extremely rare platinum mineral cooperite (PtS). Analyzed specimen. Cooperite is very rarely seen on the mineral market, much less in specimens different from polished sections, like this one, that is a single nugget. From: Tulameen River, Princeton, British Columbia, Canada. Mineral

Cooperite

cooperite

Formula
PtS
Mineral

Coparsite

coparsite

Formula
Cu4(AsO4,VO4)O2Cl
Mineraly.sk - copiapit Mineral

Copiapite

copiapite

Formula
Fe²⁺Fe³⁺4(SO4)6(OH)2·20H2O
Mineral

Copper

Formula
Cu
Mohs
2.5–3
Colour
Copper-red
White tufts of the rare mineral coquandite in a matrix of stibnite from the type locality (Pereta Mine, Scansano, Tuscany, Italy). Mineral

Coquandite

coquandite

Formula
Sb³⁺6+ₓO8+ₓ(SO4)(OH)ₓ·H2O1-ₓ (x = 0.3)