Click on thumbnails for a larger image. Please be patient since some of these pages of thumbnail images take some time to load. These mineral photos are copyrighted by their owners and may not be used without permission.
Gabrielsonite: PbFe++(AsO4)(OH)
Comments: Jet black, lustrous crystal grain, showing no faces, fractured to about 0.75mm with white pectolite-hematite matrix. Location: Langban, Varmland, Sweden. Scale: 2.5 x 1.5 x 1.5cm. © Tom Loomis / Dakota Matrix
Gallite: CuGaS2
Comments: A mixture of massive high grade ore with grains of gallite (gray) occuring with germanite and renierite. Most of what can be seen is the renierite, which has reddish and purple iridescence. Location: Tsumeb, Namibia. Scale: Picture size 1 cm. © Tom Loomis / Dakota Matrix
Geffroyite: (Ag,Cu,Fe)9(Se,S)8
Comments: Silvery-gray grains of geffroyite to <0.5mm embedded in tan barite matrix. Location: Moctezuma mine, Moctezuma, Sonora, Mexcio. Scale: Overall: 3 x 2 x 2 cm. © Tom Loomis / Dakota Matrix
Gilalite: Cu5Si6O17·7(H2O)
Comments: Green spherical crystals of gilalite to 0.3mm in grape-like bunches. Location: Christmas mine, Gila Co., Arizona, USA. Scale: Picture size 5 mm. © Tom Loomis / Dakota Matrix
Gillespite: BaFe++Si4O10 Bigcreekite: BaSi2O5·4(H2O) 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
Gorceixite: BaAl3(PO4)(PO3OH)(OH)6
Comments: Translucent, pseudohexagonal crystal of groceixite in matrix. Location: Rapid Creek, Yukon, Canada. Scale: Crystal Size 3 mm. © Tom Loomis / Dakota Matrix
Guanacoite: (Cu,Mg)2Mg2(Mg,Cu)(OH)4(H2O)4(AsO4)2
Comments: Deep blue, bladed, glassy crystals of guanacoite to 0.75mm lining vugs of arhbarite.. Location: El Guanaco Mine, Guanaco, Taltal, Antofagasta Province, Chile. Scale: Picture Size 5mm. © Tom Loomis / Dakota Matrix
Guarinoite: (Zn,Co,Ni)6(SO4)(OH,Cl)10·5(H2O)
Comments: Pale pink microcrystalline crust of guarinoite on matrix. Location: Cap Garonne mine, Var, France. Scale: Thumbnail. © Tom Loomis / Dakota Matrix
Haynesite: (UO2)3(SeO3)2(OH)2·5(H2O)
Comments: Yellow tufts of haynesite. Location: Repete mine, San Juan County, Utah, USA. Scale: Crystal size 0.5 mm. © Tom Loomis / Dakota Matrix
Hemihedrite: Pb10Zn(CrO4)6(SiO4)2F2 Phoenicochroite: Pb2(CrO4)O
Comments: Yellow hemihedrite crystals to 1 mm within pockets of dark red phoenicochroite crystalline aggregates on matrix. Location: Pack Rat claim, Maricopa Co., Arizona, USA. Scale: Picture size 1.5 cm. © Tom Loomis / Dakota Matrix
Hiarneite: (Ca,Mn,Na)2(Zr,Mn+++)5(Sb,Ti,Fe)2O16
Comments: A bright red single grain of hiarneite about 0.25mm in matrix with magnetoplumbite. Location: Langban, Varmland, Sweden. Scale: Picture size 2 mm. © Tom Loomis / Dakota Matrix
Holfertite: U++++++1.75TiCa0.25 O7.5(H2O)3
Comments: Yellow prismatic micro crystal of holfertite on clear topaz. Location: Starvation Canyon, Topaz Valley, Juab Co., Utah, USA. Scale: Crystal size 0.5 mm. © Tom Loomis / Dakota Matrix
Hsianghualite: Ca3Li2Be3(SiO4)3F2
Comments: White crystalline areas of hsianghualite in dark green chloritic schist(?). Location: Xianghualing Mine, Hunan, Central South Region, China. Scale: Not Given. © Tom Loomis / Dakota Matrix
Hubeite: Ca2Mn++Fe+++Si4O12(OH)(H2O)2 Inesite: Ca2Mn7Si10O28(OH)2·5(H2O)
Comments: Translucent, deep root beer brown, platy hueite crystals in fan-like groups to 1mm with delicate pink laths of inesite. Location: Fengjiashan Mine, Daye Co., Huangshi Prefecture, Hubei Province, China. Scale: Picture Size 5 mm. © Tom Loomis / Dakota Matrix
Hureaulite: Mn5(PO3OH)2(PO4)2·4(H2O) Tavorite: LiFe+++(PO4)(OH)
Comments: Lime green tavorite micro crystals with pink, gemmy hureaulite. Location: Tip Top mine, Custer Co., South Dakota, United States. Scale: Picture size 1.0 cm. © Tom Loomis / Dakota Matrix
Imiterite: Ag2HgS2
Comments: Silvery needle-like wire crystals of imiterite with rounded tips to 0.5 to .75mm in vuggy calcite. Location: Imiter mine, Anti-Atlas Mts., Dades Region, Morocco. Scale: Picture size 0.5 cm. © Tom Loomis / Dakota Matrix
Inesite: Ca2Mn7Si10O28(OH)2·5(H2O) Hubeite: Ca2Mn++Fe+++Si4O12(OH)(H2O)2
Ingersonite: Ca3Mn++Sb+++++4O14
Comments: Yellowish green crystals of ingersonite to about 0.7mm embedded in matrix rich in dark grains of flipstadite. Location: Langban, Varmland, Sweden. Scale: 14x10x6mm. © Tom Loomis / Dakota Matrix
Jahnsite-(CaMnMn): CaMn++Mn++2Fe+++2(PO4)4(OH)2·8(H2O)
Comments: Brown grains of jahnsite-(CaMnMn) in matrix. Location: Bendada Quarry, Belmonte, Beira Alta, Portugal. Scale: Picture size 1 cm. © Tom Loomis / Dakota Matrix
Jinshajiangite: Na2K5BaCa(Fe,Mn)8(Ti,Fe,Nb,Zr)4Si8O32(O,F,H2O)6
Comments: Reddish elongated junshajiangite grain to 0.3mm in matrix. Location: Norra Karr, Sweden. Scale: Picture size 5 mm. © Tom Loomis / Dakota Matrix