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Barylite: BaBe2Si2O7

Comments: Blocky prisimatic clear crystals of barylite with black aegirine.
Location: Mt. Malosa, Zomba plateau Malawi. Scale: 2 x 1.6 x 1.3 cm.
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Beryl: Be3Al2Si6O18

Comments: Transparent Goshenite, the colorless variety of beryl with orthoclase and muscovite.
Location: Pingwu, Sichuan, China. Scale: 9 x 8.5 cm.
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Beryl: Be3Al2Si6O18  
Calcite: CaCO3

Comments: Transparent emerald, the green variety of beryl on calcite (marble) matrix.
Location: Coscuez, Boyacá, Colombia. Scale: 2.5 x 2.5 cm.
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Betekhtinite: Cu10(Fe,Pb)S6

Comments: Black crystalline aggregate of betekhtinite with white calcite.
Location: Twin Pocket, Mine #57, Dzhezkazgan, Kazakhstan. Scale: 9.5 x 7.5 cm.
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Bismuth: Bi

Comments: Coarsely crystalline bismuth.
Location: Biggenden, Queensland, Australia. Scale: 2.9 x 1.8 x 2.8 cm.
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Bismuthinite: Bi2S3

Comments: Metallic, prismatic bismuthinite crystal topped with botryoidal marcasite.
Location: Veta Farellón viejo, Tazna, Potosí, Bolivia. Scale: 4.4x1.3x0.4 cm.
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Botallackite: Cu2Cl(OH)3

Comments: Well crystallized (although the crystals are small) botallackite on matrix.
Location: A European classic from the type locality, Botallack mine, St Just, England. Scale: 5 x 4 cm.
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Bournonite: PbCuSbS3

Comments: Bright, blocky crystalline aggregate of steel gray bournonite crystals.
Location: Yao-gan-xian mine, Hunan China. Scale: Picture size 2 cm.
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Brazilianite: NaAl3(PO4)2(OH)4

Comments: Gemmy brazilianite crystal.
Location: Marcel Telirio mine, Divino das Laranjeiras, Minas Gerais, Brazil. Scale: Size Not Given.
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Brochantite: Cu4(SO4)(OH)6  
Linarite: PbCu(SO4)(OH)2

Comments: Deep blue, acicular, linarite with light blue, globular brochantite on white quartz.
Location: Goulmina, Er Rachidia, Morroco. Scale: Crystal size 1.5 cm.
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Brookite: TiO2

Comments: Brookite crystal group on matrix. During the 19th century this site produced some of the best brookite ever seen.
Location: Classic Welsh locality of Prenteg, Gwynedd, Wales, UK. Scale: 4 x 4.5 cm.
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Calcite: CaCO3  
Beryl: Be3Al2Si6O18

Comments: Transparent emerald, the green variety of beryl on calcite (marble) matrix.
Location: Coscuez, Boyacá, Colombia. Scale: 2.5 x 2.5 cm.
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Cassiterite: SnO2

Comments: Very brilliant black crystals of cassiterite on white mica.
Location: Xue Bao Diang, Sichuan, China. Scale: Size Not Given.
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Cassiterite: SnO2

Comments: Gemmy, doubly terminated cassiterite on quartz-mica matrix.
Location: Langcangjiang river area, Yunnan, China. Scale: 2.7 x 2.2 x 1.8 cm.
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Cerussite: PbCO3  
Hydrocerussite: Pb3(CO3)2(OH)2

Comments: Platy crystals of milky white hydrocerussite covering cerussite.
Location: Tsumeb mine, Tsumeb, Namibia. Scale: 6 x 5 cm.
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Chabazite-Ca: (Ca0.5,Na,K)4[Al4Si8O24]·12H2O

Comments: Pinkish orange colored chabazite-Ca displaying a blocky, near-cubic form of triclinic crystals.
Location: Imilchil, Anti-Atlas Morocco. Scale: 4.2 x 3.7 x 1.6 cm.
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Chalcopyrite: CuFeS2  
Quartz: SiO2

Comments: Well-formed crystals of chalcopyrite and quartz.
Location: Boldut mine, 61 level (350 meters deep), Cavnic, Maramures, Rumania. Scale: 5.5 x 3.5 cm.
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Chalcostibite: CuSbS2

Comments: Dark gray crystals of chalcostibite on white quartz matrix.
Location: Boldut mine, Cavnic Maramures, Rumania. Scale: 7 x 7 x 3.5 cm.
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Chrysocolla: (Cu,Al)2H2Si2O5(OH)4·n(H2O)

Comments: Botryoidal chrysocolla lining a vug.
Location: Inca del Oro, Copiapó, Chile. Scale: 7.5 x 6 cm.
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Chrysocolla: (Cu,Al)2H2Si2O5(OH)4·n(H2O)  
Cuprite: Cu2O

Comments: Semi-metallic, dark reddish gray, cuprite crystals on blue chrysocolla.
Location: Mashamba West mine, Shaba, Congo. Scale: 7.5 x 4.7 x 2.3 cm.
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