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Arthurite: CuFe+++2(AsO4,PO4,SO4)2(O,OH)2·4(H2O)
Comments: Radiating sprays of acicular arthurite. Location: Majuba Hill mine, Pershing County, Nevada, USA. Scale: Spray size 2.5 mm. © Tom Loomis / Dakota Matrix
Artsmithite: Hg+4Al(PO4)1.74(OH)1.78
Comments: White or faint green platy micro crystals of artsmithite on matrix. Location: Funderburk prospect, Pike County, Arkansas, USA. Scale: Crystal size 0.5 mm. © Tom Loomis / Dakota Matrix
Asbolane: (Co,Ni)1-y(Mn++++O2)2-x(OH)2-2y+2x·n(H2O)
Comments: Brownish red dull grains of asbolane to 2mm in matrix. Location: Lipovka, Middla Urals, Russia. Scale: Picture size 1 cm. © Tom Loomis / Dakota Matrix
Augelite: Al2(PO4)(OH)3
Comments: Green to white, striated, blocky augelite crystal on matrix. Location: Ortega mine, Ancash dept., Peru. Scale: Crystal length 2.3 cm. © Tom Loomis / Dakota Matrix
Bakhchisaraitsevite: Na2Mg5(PO4)4·7(H2O)
Comments: Yellow-brown, platy or thin tabular crystals of bakhchisaraitsevite from an Iron mine. Red arrow indicates the mineral. Location: Kovdor massif, Kola peninsula, Russia. Scale: 5mm. © Tom Loomis / Dakota Matrix
Baotite: Ba4(Ti,Nb)8Si4O28Cl
Comments: Brown masses of crystalline baotite in white quartz matrix. Location: Inner Mongolia, Autonomous Region, China. Scale: Picture size 2 cm. © Tom Loomis / Dakota Matrix
Barahonaite-(Fe): (Ca,Cu,Na,Fe+++,Al )12Fe+++2(AsO4)8(OH,Cl)x·nH2O Conichalcite: CaCu(AsO4)(OH)
Comments: Micro yellow, platy barahonaite-(Fe) crystals associated with green "beads" of conichalcite, yellowish, earthy arseniosiderite and micro olivenite crystals. Location: Dolores prospect near the village of Pastrana, in the Province of Murcia of southeastern Spain. Scale: Specimen Size 6 x 4 x 2 cm. © Tom Loomis / Dakota Matrix
Bario-orthojoaquinite: Fe++2(Ba,Sr)4Ti2[Si4O12]O2·(H2O)
Comments: Several 0.75mm brownish red micro-crystals of bario-orthojoaquinite in matrix. Location: Dallas Gem mine, San Benito Co., California, USA. Scale: Picture size 0.5 cm. © Tom Loomis / Dakota Matrix
Barysilite: Pb8Mn(Si2O7)3
Comments: Clear, round plates of barysilite on a manganiferous matrix. Location: Langban, Varmland, Sweden. Scale: Picture size 5 mm. © Tom Loomis / Dakota Matrix
Barytocalcite: BaCa(CO3)2
Comments: White prismatic barytocalcite crystals to 6mm. Former Eaton Collection. Location: Alston Moor, Cumberland, England. Scale: 3x2x2cm. © Tom Loomis / Dakota Matrix
Bazirite: BaZrSi3O9 Sanbornite: BaSi2O5
Comments: Clear glassy minute grains of bazinite to 1mm through out matrix of milky-white sanbornite. The bazirite fluoresces light blue. Location: Snow Cap mine, Rush Creek, Fresno Co., California, USA. Scale: 6.5 x 3 x 2.5cm. © Tom Loomis / Dakota Matrix
Belovite-(La): (Sr,La,Ce,Ca)5(PO4)3(F,OH)
Comments: Yellow, pseudo-hexagonal crystal of belovite-(La) in calcite. Location: Khibina massif, Kola Peninsula, Russia. Scale: Crystal size 1.5 mm. © Tom Loomis / Dakota Matrix
Beryllite: Be3SiO4(OH)2·(H2O)
Comments: Dirty white, soft, chalky filling of beryllite (Green Arrow) in a vuggy matrix. Location: Lovozero, Mt. Karnasurt, Kola Peninsula, Russia. Scale: Size Not Given. © Tom Loomis / Dakota Matrix
Bigcreekite: BaSi2O5·4(H2O) Gillespite: BaFe++Si4O10 Sanbornite: BaSi2O5
Comments: Tiny white, spherical patterns, halo-like crystals of bigcreekite to about 0.5mm and reddish gillespite in a matrix of pale yellowish sanbornite. Location: Trumbull Peak, Mariposa Co., California, United States. Scale: 2.5 x 2 x 2cm. © Tom Loomis / Dakota Matrix
Boggsite: NaCa2(Al5Si19O48)·17(H2O)
Comments: Pure white spheroidal boggsite crystal. Location: Neer Road, Goble, Columbia Co., Oregon, USA. Scale: Crystal size 0.5 mm. © Tom Loomis / Dakota Matrix
Bokite: (Al,Fe+++)1.3(V++++,Fe)8O20·4.7(H2O)
Comments: Tannish "spots" as very micro acicular bokite crystals filling in between grains. Eaton Collection. Location: Monument #2 mine, Apache Co.,, Arizona, USA. Scale: Picture size 0.5 cm. © Tom Loomis / Dakota Matrix
Bornemanite: BaNa3{(Na,Ti)4[(Ti,Nb)2O2Si4O14](F,OH)2}·PO4
Comments: Pale yellow or peach colored, massive bornemanite. Location: Lovozero Massif, Kola Peninsula, Murmanskaja Oblast', Northern Region, Russia. Scale: Picture size 5 mm. © Tom Loomis / Dakota Matrix
Braggite: (Pt,Pd,Ni)S
Comments: Silvery grain of braggite in brassy-iridescent pentlandite matrix. Location: Stillwater Complex, Sweetwater Co., Montana, USA. Scale: 3 mm grain. © Tom Loomis / Dakota Matrix
Braunite-I: Mn++Mn+++6SiO12 Macfallite: Ca2(Mn+++,Al)3(SiO4)(Si2O7)(OH)3 Johnsenite-(Ce): Na12(Ce,REE,Sr)3Ca6Mn3Zr3W(Si25O73)(CO3)(OH,Cl)2
Comments: Tiny - less than 1mm - maroon crystals of mcfallite suspended as inclusions in massive quartz along with larger spots of brown johnsenite-(Ce) and braunite. Location: Artur mine, Jaguaracu, Minas Gerais, Brazil. Scale: Overall 3 x 2.5 slab. © Tom Loomis / Dakota Matrix
Bromellite: BeO Magnesioferrite: MgFe+++2O4
Comments: A micro, water color, hexagonal or barrel shaped crystal of white bromellite to about 0.3 mm on yellowish calcite with associated black magnesioferrite. Location: Langban, Varmland, Sweden. Scale: 18x9x10mm. © Tom Loomis / Dakota Matrix