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Minerals

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Orange microcrystals of the extremely rare mineral braccoite (IMA 2013-093). From: Valletta Mine, Vallone della Valletta, Canosio, Maira Valley, Cuneo Province, Piedmont, Italy. Mineral

Braccoite

braccoite

Formula
NaMn²⁺5[Si5O14(OH)](AsO3)(OH)
Mineral

Bracewellite

bracewellite

Formula
CrO(OH)
Brackebuschite Locality: Venus Mine, Venus Pb-Zn deposit, Sierra de Córdoba, Córdoba, Argentina (Locality at mindat.org) Size: 3.8 x 3.4 x 2.6 cm. A specimen rich with coverage of microcrystallized Brackebuschite, from the type locality. These were found as far back as the 1880s and named after a prominent Argentine mineralogist. There is a lot of descloizite in the material from here. The brackebuschite is in clusters of almost acicular crystals, very minute. Ex. Philadelphia Academy of Sciences Collection. Mineral

Brackebuschite

brackebuschite

Formula
Pb2Mn³⁺(VO4)2(OH)
Mineral

Bradaczekite

bradaczekite

Formula
NaCu4(AsO4)3
Mohs
3
Brown crystal aggregates of the very rare mineral carbonate-phosphate mineral bradleyite associated to white acicular loughlinite from Westvaco Mine, Green River Basin, Sweetwater County, Wyoming, United States of America. Ex Vandenbroucke Museum collection from Waregem, Belgium. Mineral

Bradleyite

bradleyite

Formula
Na3Mg(CO3)(PO4)
Braggite is a rare Pt-Pd-Ni sulfosalt and moncheite is a rare Pt-Pd-Te-Bi sulfosalt and are members of rare sulfosalt series. Specimens of any species are very uncommon from the obscure Stillwater Complex of Montana. This polished serpentine slab hosts both species in very rare combination. Splendent brassy braggite laths to about 3 mm are scattered on the sliced and polished serpentine matrix with silvery-bright amoeba-looking moncheite masses to about 1.0 cm. Ex. Josef Vajdak Collection. He was known as one of the top rarities dealers in such things in the second half of the 1900s. Mineral

Braggite

braggite

Formula
PtS
Mohs
6
Mineral

Braithwaiteite

braithwaiteite

Formula
NaCu²⁺5(Sb⁵⁺Ti⁴⁺)O2(AsO4)4[AsO3(OH)]2·8H2O
Mineral

Braitschite-(Ce)

braitschite-(Ce)

Formula
(Ca,Na2)7(Ce,La)2B22O43·7H2O
Hartite Locality: Oberhart near Gloggnitz, Austria Exposed in the Mineralogical Museum of University Bonn, Germany Mineral

Branchite

branchite

Formula
C20H34
Mohs
1
Sharp colorless crystals of the rare mineral brandholzite on matrix. From: Kriznica Mine, Pernek, Bratislavsky Kraj, Slovakia (Slovak Republic). Mineral

Brandholzite

brandholzite

Formula
MgSb2(OH)12·6H2O
Brandtite Locality: Fuchs Quarry, Hartkoppe Mt., Sailauf, Hösbach, Spessart Mts, Franconia, Bavaria, Germany Field of view 5 mm. Specimen and photo Leon Hupperichs. Mineral

Brandtite

brandtite

Formula
Ca2Mn²⁺(AsO4)2·2H2O
Mohs
3.5
Mineral

Brandãoite

brandãoite

Formula
BeAl2(PO4)2(OH)2(H2O)5
Brannerite Locality: Dieresis Mine, El Cabril, Sierra Albarrana, Hornachuelos, Córdoba, Andalusia, Spain (Locality at mindat.org) This is a huge, amazingly symmetrical and complete-all-around crystal of a very rare complex uranium oxide! I think it is a very significant specimen! 6.1 x 4.2 x 3.7 cm Mineral

Brannerite

brannerite

Formula
UTi2O6
White tabular colorless crystals of the rare Sn-mineral brannockite from the TL: Foote Mine, Cleveland County, North Carolina, United States of America. Ex Vandenbroucke Museum collection from Waregem, Belgium. Mineral

Brannockite

brannockite

Formula
(K,Na)☐2Li3(Sn,Zr,Ti)2[Si12O30]
Group of colourless rösslerite crystals on white brassite from the famous locality of Jachymov (Bohemia, Czech Republic). Mineral

Brassite

brassite

Formula
Mg(AsO3OH)·4H2O
Image of the brattforsite (arrow points to the largest aggregate) type specimen with jacobsite (black) and calcite (whitish), GEO-NRM #19100303. Inset image shows a detail on the specimen (red frame). The image is published in an open access article (Brattforsite, Mn19(AsO3)12Cl2, a new arsenite mineral related to magnussonite, from Brattforsgruvan, Nordmark, Värmland, Sweden: https://link.springer.com/article/10.1007/s00710-021-00749-9) distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/). Mineral

Brattforsite

brattforsite
Mineral

Braunerite

braunerite

Formula
K2Ca(UO2)(CO3)3·6H2O
Braunite Locality: Wessels Mine (Wessel's Mine), Hotazel, Kalahari manganese fields, Northern Cape Province, South Africa (Locality at mindat.org) Size: 2.9 x 2.1 x 1.8 cm. This toenail-sized specimen, properly a small miniature, is a solid cluster of these cogwheel-like, super-lustrous, jet black crystals (to 4mm) in a cluster. Mineral

Braunite

braunite

Formula
Mn²⁺Mn³⁺6(Si8O4)
Braunite Locality: N'Chwaning Mines, Kuruman, Kalahari manganese fields, Northern Cape Province, South Africa (Locality at mindat.org) Size: 4.2 x 3.1 x 2.3 cm. A splendid and rich matrix specimen of lustrous wedge-shaped Braunite-II crystals that range up to 8mm in length. Most of the crystals are smooth (unusual), lustrous, and well-terminated with a chisel point. Aesthetic and superb example of this very rare species in a unique habit found only here (noted as Braunite-II according to the experts to distinguish it crystallographically from the Braunite of other locales. Ex. Charlie Key. Mineral

Braunite Ii

braunite II

Formula
Ca(Mn³⁺)14SiO24
Brazilianite - Conselheiro Pena, Doce valley, Minas Gerais, Southeast Region, Brazil - 3.6 × 3.1 cm. Mineral

Brazilianite

brazilianite

Formula
NaAl3(PO4)2(OH)4
Mohs
5.5
Mineral

Bredigite

bredigite

Formula
Ca7Mg(SiO4)4
Breithauptite, Skutterudite, Calcite Dimensions: 3,1 cm x 2,6 cm x 2,3 cm Locality: St Andreasberg, Braunlage, Goslar District, Lower Saxony, Germany The historic mines at St. Andreasberg are the Type Locality for the rare nickel antimonide, breithauptite, a member of the Nickeline Group. It was named in 1840. It is distinguished by its bright copper-red color with a violet tint. Patches and isolated blebs of lustrous breithauptite with sections of gray smaltite, the arsenic-deficient variety of skutterudite are scattered in the miniature calcite matrix. Pink calcite fluorescence. The last mines closed in 1910 and wonderful specimens, such as this probably date to the mid to late 1800s. Ex Kay Robertson Collection # 3002 and acquired at the San Jose Show in 1963. Kay assembled a nice suite of classics and rarities from this famed district. Kay is a prominent California collector, who specialized in European classics (see the article in the March-April, 2007 Mineralogical Record). See the Mineralogical Record St. Andreasberg Special Issue, May-June, 2017, Vol. 48, No. 3. Quality breithauptite specimens are rare from here. Mineral

Breithauptite

breithauptite

Formula
NiSb
Mohs
5.5
Brendelite Locality: Güldener Falk Mine, Neustädtel, Schneeberg District, Erzgebirge, Saxony, Germany Picture width 2 mm. Collection and photograph Christian Rewitzer Mineral

Brendelite

brendelite
Brenkite Field of view: 2 mm Locality: Schellkopf (TL), Brenk, Brohltal, Ahrweiler, Rhineland-Palatinate, Germany Mineral

Brenkite

brenkite

Formula
Ca2(CO3)F2