Mineral Specimen Images (G)

Geigerite: Mn5(AsO3OH)2(AsO4)2·10(H2O)

Comments: Small, brownish grains of transparent geigerite (see lower image) in a silicous breccia.
Location: Mt. Nero Mine, Borghetto di Vara, La Spieza, Italy. Scale: 3.5 x 1.5 cm.
© Rich Geiger

Geikielite: MgTiO3

Comments: Black, lustrous crystals of geikielite in matrix.
Location: Monte dei tre Abati, Coli, Piacenza Province, Emilia-Romagna, Italy. Scale: Picture size 2.2 mm.
© Thomas Witzke / Abraxas-Verlag

Geminite: Cu++2As+++++2O7·3(H2O)

Comments: Pale greenish crystals of geminite with a light blue, lavendulane-related mineral.
Location: Shaft 371, Schlema-Hartenstein area, Erzgebirge, Saxony, Germany. Scale: Picture size 4 mm.
© Thomas Witzke / Abraxas-Verlag

Genkinite: (Pt,Pd)4Sb3

Comments: Genkinite (3), with a typical rim of an undetermined oxidation product (darker grey), closely associated with platarsite (2) and Pt-Fe alloy (1). Chromite crystals (4).
Location: In the Onverwacht and Driekop mines, Transvaal, South Africa. (CanMin, v15:389). Scale: See Image.
© Canadian Mineralogist

Genthelvite: Zn4Be3(SiO4)3S

Comments: Pyramidal crystals of genthelvite.
Location: Mont St. Hilaire, Quebec, Canada. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Geocronite: Pb14(Sb,As)6S23

Comments: Many black geocronite crystals intergrown in milky quartz(?) matrix.
Location: Sala Silver Mine, Sala, Västmanland, Sweden. Scale: 17x17x12 mm.
© John Betts - Fine Minerals

Georgbarsanovite: Na12(Mn,Sr,REE)3Ca6Fe++3Zr3NbSi25O76Cl2·H2O

Comments: A small translucent crystalline fragment of georgbarsanovite, from the type locality.
Location: Nepheline pegmatite outcrop, Petrelius River, Khibiny Massif, Kola Peninsula, Murmanskaja Oblast', Northern Region, Russia. Scale: Fragment Size 0.05 cm,.
© Jeff Weissman / Photographic Guide to Mineral Species

Georgbokiite: Cu5O2(SeO3)2Cl2

Comments: Deep reddish brown polished fragment of georgbokiite embedded in epoxy, co-type material.
Location: Tolbachik Volcano, Kamchatka Peninsula, Russia. Scale: Picture Size 300 µm.
© Rruff Database

George-ericksenite: Na6CaMg(IO3)6(CrO4)2·12(H2O)

Comments: Scanning electron microscope (SEM) photomicrograph of part of a georgeericksenite aggregate: note the cracking of the crystals due to H2O loss under the SEM vacuum. (AmMin 83:391).
Location: Museum specimen labeled as originating from Oficina Chacabuco, Chile.. Scale: See Image.
© American Mineralogist

Georgechaoite: KNaZrSi3O9·2(H2O)

Comments: Single tan crystal of georgechaoite.
Location: Tolbachik Volcano, Kamchatka, Russia. Scale: Crystal Size 1.2 mm.
© Diederik Visser

Georgeite: Cu++5(CO3)3(OH)4·6(H2O)

Comments: Pale blue crusts of georgeite with dark green atacamite.
Location: Carr-Boyd Nickel Mine, Western Australia, Australia. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Georgiadesite: Pb4(AsO3)Cl4(OH)

Comments: Light blue, pseudo-cubic crystal of georgiadesite.
Location: Laurium, Greece. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Gerasimovskite: (Mn,Ca)(Nb,Ti)5O12·9(H2O) (?)  
Ussingite: Na2AlSi3O8(OH)

Comments: Pale tan gerasimovskite pseudomorphous after epistolite crystal, in purple ussingite.
Location: Lovozero Massif, Kola Peninsula, Murmansk District, Russia. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Gerenite-(Y): (Ca,Na)2(Y,REE)3Si6O18·2(H2O)

Comments: BSE image of eutectoid intergrowth of quartz (black) and gerenite-(Y) (white). (CanMin, v36:793).
Location: Strange Lake peralkaline complex, Quebec-Labrador boundary, Canada. Scale: Scale Bar 100 µm.
© Canadian Mineralogist

Gerhardtite: Cu2(NO3)(OH)3

Comments: Emerald green crystalline crust of gerhardtite on copper.
Location: Greenland, Ontonagon County, Michigan, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Germanite: Cu26Fe4Ge4S32

Comments: Red metallic germanite, tarnishing black.
Location: Tsumeb, Oshikoto, Namibia. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Gersdorffite: NiAsS

Comments: Massive to coarse-grained lead-gray gersdorffite crystals.
Location: Ait Ahmane Mine, Bou Azzer, Anti Atlas Mts., Morocco. Scale: Not Given.
© John Veevaert

Gerstleyite: Na2(Sb,As)8S13·2(H2O)

Comments: Small prismatic crystals and massive cinnabar-red gerstleyite on matrix.
Location: Baker mine, U.S. Borax Mine, Boron, Kramer District, Kern Co., California, USA. Scale: Picture size 5 mm.
© Thomas Witzke / Abraxas-Verlag

Getchellite: AsSbS3

Comments: Bright red getchellite on matrix.
Location: Khaidarkan (Chaidarkan) Sb-Hg deposit, Fergana Valley, Osh District, Kyrgyzstan. Scale: Picture size 7 mm.
© Thomas Witzke / Abraxas-Verlag

Geversite: Pt(Sb,Bi)2

Comments: Several PGM (mertieite, geversite: white) in a silicate matrix (black) of ferrian chromite (FeCr). (CanMin v40:277).
Location: Gabbro-hosted Precambrian Baula Complex, in Orissa, India. Scale: See Image.
© Canadian Mineralogist