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Gatumbaite: CaAl2(PO4)2(OH)2·(H2O) Burangaite: (Na,Ca)2(Fe++,Mg)2Al10(PO4)8(OH,O)12·4(H2O)
Comments: Small, blue burangaite crystals in beige gatumbaite. Location: Horrsjoberg, Torby, Värmland, Sweden. Scale: Micro-mount Size. © Sonke Stolze / Systematic Minerals
Gatumbaite: CaAl2(PO4)2(OH)2·(H2O) Apatite-(CaF): Ca5(PO4)3F
Comments: White crystalline gatumbaite with yellow brazilianite in massive blue fluorapatite. Location: Buranga Pegmatite, near Gatumba, Gisenyi, Rwanda. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Gaudefroyite: Ca4Mn+++3-x(BO3)3(CO3)(O,OH)3
Comments: Dark gray, prismatic gaudefroyite with crystals to 1.5 cm. Location: N'Chwaning Mine, Kalahari Manganese Field, Northern Cape Province, South Africa. Scale: 7.8 x 4.2 cm. © John Veevaert
Gaylussite: Na2Ca(CO3)2·5(H2O)
Comments: Clear, nearly colorless crystals of gaylussite. Location: Trona, Searles Lake, San Bernardino County, California, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Gearksutite: CaAl(OH,F)5·(H2O)
Comments: White gearksutite crust on quartz. Location: Saint Peter's Dome, El Paso County, Colorado, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Gedrite: [ ]Mg5Al2Si6Al2O22(OH)2 Magnesiogedrite: (Mg,Fe++)5Al2Si6Al2O22(OH)2
Comments: Dark gray cleavage fragment of magnesiogedrite (gedrite). Location: Bamble, Telemark, Norway. Scale: See Image. © Rruff Database
Gedrite: [ ]Mg5Al2Si6Al2O22(OH)2
Comments: Back prismatic crystalline gedrite in rock. Location: Schissgruvan, near Ludvika, Dalarna, Kopparberg, Sweden. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
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
Gehlenite: Ca2Al(AlSi)O7
Comments: Contact area between vesuvianite (right) and gehlenite (left). Note the lamellae of clintonite included mainly in the gehlenite crystals (CanMin v. 41. p 1259). Location: Skarns along the contact of a diorite intrusion at Oravit¸a, Banat, in Romania. Scale: Image size 2.7 mm. © Canadian Mineralogist
Comments: Crystalline massive gehlenite. Location: Crestmore Quarry, Riverside County, California, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species