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Bluish-green tounkite with bright sulphur-yellow bystrite and blue lazurite in white calcite matrix from the type locality for both species (Malo-Bystrinskoe, Malaya Bystraya River Valley, Lake Baikal, Irkutsk Oblast, Russian Federation). Bystrite and tounkite are very rare silicates. Ex. Erich Laskowski collection (USA). Mineral

Bystrite

bystrite

Formula
(Na,K)7Ca(Al6Si6O24)(S5)Cl
Grey massive crystal aggregates of the very rare Mg-Sb mineral bystromite from the type locality in Sonora (La Fortuna Mine, El Antimonio, Caborca Municipality, Sonora, Mexico), and associated to yellow stibiconite. Mineral

Byströmite

byströmite

Formula
MgSb⁵⁺2O6
Mohs
7
Mineral

Bytízite

bytízite
Mineral

Byzantievite

byzantievite

Formula
Ba5(Ca,REE,Y)22(Ti,Nb)18(SiO4)4[(PO4),(SiO4)]4(BO3)9O22[(OH),F]43·1.5H2O
Béhierite Locality: Antsongombato gem mine, FKT Antsentsindrano, Andrembesoa Commune, Betafo District, Vakinankaratra Region, Antananarivo Province, Madagascar (Locality at mindat.org) This rare earth Borate is the Tantalum analogue of Schiavinatoite. This is a remarkable example of this incredibly rare species. It features a few small, sharp, well formed, brownish colored pseudo-octahedra of Behierite on pegmatite matrix. There are very few rare earth Borates in the mineral world. 3.8 x 3.3 x 2.6cm Mineral

Béhierite

béhierite
Bilinite, 20 mm, Bululduz ore manifestation, Lachin region, Azerbaijan, from S.F. Veli-zade's collection Mineral

Bílinite

bílinite

Mohs
2
Böhmite crystals on Natrolite (Field of view 10 mm) Locality: Saga 1 Quarry, Sagåsen (Strandåsen), Mørje, Porsgrunn, Telemark, Norway Mineral

Böhmite

böhmite

Formula
AlO(OH)
Mohs
3.5
Outstanding dark orange single crystal of the extremely rare mineral bøggildite from the TL and only known locality in Ivigtut (Ivigtut, Ivittuut, Arsuk Fjord, Sermersooq, Greenland). Ex Vandenbroucke Museum collection from Waregem, Belgium. Mineral

Bøggildite

bøggildite

Formula
Na2Sr2Al2(PO4)F9
Mineral

Bøgvadite

bøgvadite
A lot of white single crystals of the very rare minerals fairchildite and bütschliite from a locality in Ontario: Desoronto, Richmond Township, Lennox & Addington County, Ontario, Canada. Fairchildite and Bütschliite are two very rare K-Ca carbonates. Ex Vandenbroucke Museum collection from Waregem, Belgium. Mineral

Bütschliite

bütschliite
Běhounekite Locality: Geschieber vein, Svornost Mine, Jáchymov, Jáchymov District, Krušné Hory Mts, Karlovy Vary Region, Czech Republic (locality at mindat.org) Description: Field of view 3 mm Mineral

Běhounekite

běhounekite

Formula
U(SO4)2(H2O)4
Cabalzarite Locality: Falotta, Tinizong (Tinzen), Oberhalbstein (Surses; Sursass), Albula Valley, Grischun (Grisons; Graubünden), Switzerland Field of view 4 mm. Mineral

Cabalzarite

cabalzarite

Formula
CaMg2(AsO4)2·2H2O
Mineral

Cabrerite

cabrerite

Formula
NiMg2(AsO4)2·8H2O
A selection of backscatter electron (BSE) images of platinum-group minerals identified in the till samples. (a) Braggite ((Pt,Pd,Ni)S); (b) Cooperite (PtS); (c) Moncheite ((Pt,Pd)(Te,Bi)2); (d) Stillwaterite (Pd8As3); (e) Mertieite-II (Pd8(Sb,As)3); (f) Taimyrite ((Pd,Cu,Pt)3Sn); (g) Cabriite (Pd2SnCu); (h) Isomertieite (Pd11Sb2As2); (i) Paolovite (Pd2Sn); (j) Potarite (PdHg); (k) Stibiopalladinite (Pd5Sb2); (l) Platinum (Pt). The image is published in an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license. Mineral

Cabriite

cabriite

Formula
Pd2CuSn
Mineral

Cabvinite

cabvinite

Formula
Th2F7(OH)·3H2O
Cacoxenite Locality: El Horcajo Mine, Minas de Horcajo, Ciudad Real, Castile-La Mancha, Spain Picture width 3 mm. Collection and photograph Christian Rewitzer This Photo was Mindat.org Photo of the Day - 10th Jul 2007 Mineral

Cacoxenite

cacoxenite

Formula
Fe³⁺24AlO6(PO4)17(OH)12·75H2O
:A lot of very small native cadmium nuggets from the type locality for the mineral and only one of the four known localities worldwide: Ust'-Khann'ya Intrusion, Lower Khann'ya River, Vil, Eastern Siberia, Russian Federation. Native cadmium is one of the rarest native elements, and a very sought after mineral for the collectors of native elements, since this species is almost never seen on the mineral market, much less in well identified and analyzed specimens, like this one (by SEM/EDS). The purity of the cadmium nuggets is 97,7 % (total percentage) or 94,6% (atomic percentage). In the photo there are some honey yellow sphalerite as an impurity. Mineral

Cadmium (Native)

cadmium (native)
Cadmoindite, from Kudriavy Volcano, Iturup Island, Sakhalinskaya Obl, Far Eastern Region, Russian Federation Mineral

Cadmoindite

cadmoindite

Formula
CdIn2S4
Mohs
4
Extremely rare cadmium selenium mineral cadmoselite from the type locality: Ust' Uyok Deposit, Turan District, Tuva Republic, Russian Federation. Specimen analyzed by SEM/EDS. Ex Vandenbroucke Museum collection specimen, from Waregem, Belgium. Mineral

Cadmoselite

cadmoselite

Formula
CdSe
Mohs
4
Mineral

Cadsulfohite

cadsulfohite

Formula
Cd2(SO4)(OH)2
Mineral

Cadvanite

cadvanite

Formula
Cd(VO3)2
Yellow microcrystals and masses of the very rare aluminium chloride-hydroxide mineral cadwaladerite from only one the three known localities worldwide: Maria Mine, Caleta Vítor District, Arica & Parinacota Region, Chile. Mineral

Cadwaladerite

cadwaladerite

Formula
AlCl(OH)2·4H2O
Colour
yellow
Mineral

Caesiumpharmacosiderite

caesiumpharmacosiderite

Formula
CsFe4[(AsO4)3(OH)4]·4H2O
Cafarsite Locality: Wanni glacier - Scherbadung Mt. (Cervandone Mt.) area, Kriegalp Valley (Chriegalp Valley), Binn Valley, Wallis (Valais), Switzerland (Locality at mindat.org) Size: thumbnail, 2.6 x 1.8 x 0.3 cm Cafarsite This specimen features numerous sharp 2-4 mm crystals on matrix. Excellent reference example! 2.6 x 1.8 x 0.3 cm Mineral

Cafarsite

cafarsite

Formula
Ca5.9Mn1.7Fe3Ti3(AsO3)12 * 4-5H2O