Mineral Specimen Images (G)

Ganophyllite: (K,Na)2(Mn,Al,Mg)8(Si,Al)12O29(OH)7·8-9(H2O)

Comments: Light brown micaceous ganophyllite with milky quartz.
Location: Gambatesa Mine, Genova, Liguria, Italy. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Ganophyllite: (K,Na)2(Mn,Al,Mg)8(Si,Al)12O29(OH)7·8-9(H2O)

Comments: SEM image of a ganophyllite crystal. (AmMin, 88:1325).
Location: Molinello Mine, Val Graveglia, Italy. Scale: Scale bar 100 µ-m.
© American Mineralogist

Ganterite: [Ba0.5(Na,K)0.5]Al2(Si2.5Al1.5O10)(OH)2

Comments: Black and white thin-section micrograph of ganterite in white mica schist (sample SS9787) (S.Gt: synkinematic ganterite; P.Gt: postkinematic ganterite. (CanMin 41:1284).
Location: Metamorphosed basement rocks from the Berisal Complex, Simplon Region, Switzerland. Scale: See Image.
© Canadian Mineralogist

Ganterite: [Ba0.5(Na,K)0.5]Al2(Si2.5Al1.5O10)(OH)2

Comments: BSE image of thin-section showing ganterite (G) portion of a larger muscovite (M) grain. The lighter color corresponds to greater heavy element (Ba) contents. AmMin, v92, p703.
Location: Lincoln Hill dumortierite deposit in the Humboldt Range located near Oreana, Pershing County, Nevada. Scale: Picture size 300 µm.
© American Mineralogist

Garronite: Na2Ca5Al12Si20O64·27(H2O)  
Siderite: Fe++CO3

Comments: Translucent white micro crystals of garronite on brown siderite crystals.
Location: Mont Saint Hilaire, Quebec, Canada. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Gartrellite: Pb(Cu,Fe++)2(AsO4,SO4)2(CO3,H2O)0.7

Comments: Lime green gartrellite on matrix associated with mimetite. Former Martín Oliete Fontela collection.
Location: Tsumeb mine, Tsumeb, Namibia. Scale: 6x4x3 cm.
© Fabre Minerals

Garyansellite: (Mg,Fe+++)3(PO4)2(OH,O)·1,5(H2O)

Comments: Brown crystalline garyansellite with quartz.
Location: Rapid Creek, Yukon Territory, Canada. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Gasparite-(Ce): CeAsO4

Comments: Crude gasparite-(Ce) crystal possibly pseudomorphous after synchysite.
Location: Mount Cervandone,Devero Valley, Baceno, Ossola Valley, Piedmont, Italy. Scale: Crystal Size 2 mm.
© Carlo Guidarin

Gaspeite: (Ni,Mg,Fe++)CO3

Comments: Green, crystalline massive gaspeite in matrix.
Location: Lemieux Township, Gaspe Peninsula, Gaspe Nord County, Quebec, Canada. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Gatelite-(Ce): (Ca,Ce,La,Nd)4(Al,Mg,Fe)4[Si2O7][SiO4]3(O,F,OH)3

Comments: B&W image of crystals of gatelite-(Ce). (AmMin, v88:223).
Location: Trimouns talc deposit, Luzenac, Ariege, French Pyrenees. Scale: Crystal Length 700 µm.
© R. Vernet / American Mineralogist

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

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

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

Comments: Back prismatic crystalline gedrite in rock.
Location: Schissgruvan, near Ludvika, Dalarna, Kopparberg, Sweden. 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

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: Crystalline massive gehlenite.
Location: Crestmore Quarry, Riverside County, California, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

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