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Bornite: Cu5FeS4
Comments: Metallic, crystalline bornite crystal with bluish tarnish. Location: Kamoto mine, Kolwezi, Shaba, Dem. Repub. Congo. Scale: Size Not Given. © Lou Perloff / Photo Atlas of Minerals
Brandtite: Ca2(Mn,Mg)(AsO4)2·2(H2O)
Comments: Clear, crystalline brandtite aggregates. Location: Harstig mine, Pajsberg, Varmland, Sweden. Scale: Size Not Given. © Lou Perloff / Photo Atlas of Minerals
Brannockite: KSn2Li3Si12O30
Comments: Clear, hexagonal plates of brannockite crystals. Location: Foote mine, Kings Mountain, Cleveland County, North Carolina, USA. Scale: Size Not Given. © Lou Perloff / Photo Atlas of Minerals
Bravoite: (Fe,Ni,Co)S2
Comments: Steel gray, metallic crystal of bravoite on brassy yellow chalcopyrite. Location: Gey, Rhineland-Palatinate, Germany. Scale: Size Not Given. © Lou Perloff / Photo Atlas of Minerals
Breithauptite: NiSb
Comments: Three brownish, metallic hexagonal prisms of breithauptite in calcite. Location: Sarrabus, Sardinia, Italy. Scale: Size Not Given. © Lou Perloff / Photo Atlas of Minerals
Brochantite: Cu4(SO4)(OH)6
Comments: Blue green spray of acicular brochantite crystals on matrix. Location: Douglas Hill, Lidwig, Lyon County, Nevada, USA. Scale: Size Not Given. © Lou Perloff / Photo Atlas of Minerals
Bromargyrite: AgBr
Comments: Butterscotch colored bromargyrite cube. Location: Broken Hill, New South Wales, Australia. Scale: Size Not Given. © Lou Perloff / Photo Atlas of Minerals
Butlerite: Fe+++(SO4)(OH)·2(H2O)
Comments: Orange butlerite crystals. Location: United Verde mine, Jerome, Yavapai County, Arizona, USA. Scale: Size Not Given. © Lou Perloff / Photo Atlas of Minerals
Cahnite: Ca2B(AsO4)(OH)4
Comments: White, translucent cahnite crystal on hodgkinsonite. Location: Franklin, Sussex County, New Jersey, USA. Scale: Size Not Given. © Lou Perloff / Photo Atlas of Minerals
Calaverite: AuTe2
Comments: Quartz matrix with abundant calaverite crystals. Location: Cripple Creek, Teller County, Colorado, USA. Scale: Size Not Given. © Lou Perloff / Photo Atlas of Minerals