Mineral Specimen Images (B)

Brownmillerite: Ca2(Al,Fe+++)2O5

Comments: Brownish-orange masses of brownmillerite in skarn.
Location: Bellerberg, Ettringen, Eifel Mountains, Rheinland-Pfalz, Germany. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Brownmillerite: Ca2(Al,Fe+++)2O5  
Reinhardbraunsite: Ca5(SiO4)2(OH,F)2

Comments: Pink crystalline reinhardbraunsite in brownmillerite.
Location: Near Bellerberg, Eifel, Rheinland-Pflaz, Germany. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Brucite: Mg(OH)2

Comments: Crystal cluster of brucite.
Location: N'Chwaning Mine, Kalahari Manganese Field, Northern Cape Province, South Africa. Scale: 7 x 5 x 4 cm.
© John Veevaert

Brucite: Mg(OH)2

Comments: Pearly white, pseudohexagonal crystals of brucite on matrix.
Location: Pilcante, Trentino, Italy. Scale: Crystal size 1.6 cm.
© Sandro Maggia/Minernet.it

Brugnatellite: Mg6Fe+++(CO3)(OH)13·4(H2O)

Comments: Botryoidal brugnatellite.
Location: Monte Ramazzo, Liguria, Italy. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Brunogeierite: (Ge++,Fe++)Fe+++2O4  
Stottite: Fe++Ge(OH)6

Comments: Brownish gray, cubic (tetartoidal) brunogeierite crystals with earthy gray stottite and zincian siderite matrix.
Location: Tsumeb, Namibia. Scale: Cabinent Size.
© William Pinch

Brushite: CaHPO4·2(H2O)

Comments: Tan coatings of brushite on calcite.
Location: Oberschleme, Erzgebirge Mountains, Sachsen, Germany. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Buddingtonite: (NH4)AlSi3O8·0.5(H2O)

Comments: Chalky massive buddingtonite.
Location: Sharon Heights, Menlo Park, San Mateo County, California, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Buergerite: NaFe+++3Al6(BO3)3Si6O21F

Comments: Doubly-terminated brownish buergerite tourmaline crystals on matrix.
Location: Mexquitic, San Luis Potosí, Mexico. Scale: 26x15x13 mm.
© John Betts - Fine Minerals

Bukovite: Tl2Cu3FeSe4

Comments: Silvery metallic minute aggregates of bukovite in white calcite (polished mount).
Location: Predborice, Stredocesky, Czech Republic. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Bukovskyite: Fe+++2(AsO4)(SO4)(OH)·7(H2O)  
Zykaite: Fe+++4(AsO4)3(SO4)(OH)·15(H2O)

Comments: Pale beige acicular crystals of bukovskýite with white zykaite.
Location: Christbescherung Mine, Großvoigtsberg, Freiberg District, Erzgebirge, Saxony, Germany. Scale: Picture size 1.3 mm.
© Thomas Witzke / Abraxas-Verlag

Bultfonteinite: Ca2SiO2(OH,F)4

Comments: Rounded, spherical aggregation of acicular bultfonteinite crystals.
Location: N'Chwaning Mine, Kalahari Manganese Field, Northern Cape Province, South Africa. Scale: 8.5 x 4.6 cm.
© John Veevaert

Bultfonteinite: Ca2SiO2(OH,F)4  
Oyelite: Ca10B2Si8O29·12(H2O)

Comments: White encrustation of oyelite covering brownish botryoidal bultfonteinite.
Location: N'Chwaning Mine, Kalahari Manganese Field, Northern Cape Province, South Africa. Scale: 2 x 4 cm.
© John Veevaert

Bultfonteinite: Ca2SiO2(OH,F)4  
Poldervaartite: (Ca,Mn++)2SiO3(OH)2

Comments: Bow-tie clusters of white, acicular bultfonteinite and blocky, beige-colored poldervaartite on matrix.
Location: N'Chwaning mine, South Africa. Scale: picture size 4 cm.
© John Veevaert

Bunsenite: NiO

Comments: Greenish earthy bunsenite.
Location: Johanngeorgenstadt, Erzgebirge, Saxony, Germany. Scale: Picture size 5 mm.
© Thomas Witzke / Abraxas-Verlag

Burangaite: (Na,Ca)2(Fe++,Mg)2Al10(PO4)8(OH,O)12·4(H2O)  
Gatumbaite: CaAl2(PO4)2(OH)2·(H2O)

Comments: Small, blue burangaite crystals in beige gatumbaite.
Location: Horrsjoberg, Torby, Värmland, Sweden. Scale: Micro-mount Size.
© Sonke Stolze / Systematic Minerals

Burbankite: (Na,Ca)3(Sr,Ba,Ce)3(CO3)5

Comments: White crystal of burbankite (see arrow) and bluish green fluorite on matrix.
Location: Pocos de Caldes, Minas Gerais, Brazil. Scale: Crystal size 2 mm.
© John Veevaert

Burbankite: (Na,Ca)3(Sr,Ba,Ce)3(CO3)5

Comments: Yellow massive burbankite.
Location: Big Sandy Creek, near Rocky Boy, Big Bear Paw Mountains, Hill County, Montana, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Burckhardtite: Pb2(Fe+++,Mn+++)Te++++(AlSi3O10)O2(OH)2·(H2O)  
Moctezumite: Pb(UO2)(TeO3)2

Comments: Pink crusts of burckhardtite with yellow crystalline moctezumite on quartz.
Location: Moctezuma Mine, Moctezuma, Sonora, Mexico. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Burgessite: Co2(H2O)4[(AsO3OH)]2·(H2O)

Comments: Rosettes of burgessite showing the individual lath-like crystals and their adamantine luster. (CanMin, v47:159).
Location: Keeley mine, South Lorrain Township, Timiskaming District, Ontario, Canada.. Scale: Picture size 1.1 mm.
© Canadian Mineralogist